$Id: History,v 1.47 2010/09/06 09:13:46 gcosmo Exp $
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     =========================================================
     Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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                      Category History file
                      ---------------------
This file should be used by G4 developers and category coordinators
to briefly summarize all major modifications introduced in the code
and keep track of all category-tags.
It DOES NOT substitute the  CVS log-message one should put at every
committal in the CVS repository !

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     * Reverse chronological order (last date on top), please *
     ----------------------------------------------------------

September 6th, 2010 G.Cosmo geombias-V09-03-01
     - Fixed false-positive cases of invalid iterator in G4IStore and
       G4WeightWindowStore.

July 2nd, 2010 G.Cosmo geombias-V09-03-00
     - G4IStore: corrected use of internal cell-importance iterator to avoid
       invalidation in methods GetImportance().
     - Corrected mispelled name for GetLowerWeight() method in classes
       G4WeightWindowStore and G4VWeightWindowStore. Fixed use of internal
       cell-importance iterator in G4WeightWindowStore::GetLowerWeight() to
       avoid cases of invalidation.
     - Fixed initialization of data in copy-constructor for G4GeometryCell
       and corrected mispelled name for data member pointer.

November 9th, 2007 A.Howard geombias-V09-00-01
     - Revised search algorithm to Weight/UpperBound + 1.

November 9th, 2007 A.Howard geombias-V09-00-00
     - Modified WeightWindow algorithm according to Thomas Booth's
       recommendation (MCNP author). In order to not introduce extra variance 
       in the case of splitting to the survival weight when the weight is 
       above the upper weight window - modified G4WeightWindowAlgorithm.cc

June 4th, 2007 A.Howard geombias-V08-03-02
     - Put back some missing store and scoring classes:
       G4IStore, G4VCellScorerstore, G4VCellScorer

May 31st, 2007 A.Howard geombias-V08-03-01
     - Removed classes from old biasing scheme.  These are now replaced by
       either CoupledTransportation (parallel navigation) or in 
       processe/biasing.  In addition the scoring is implemented with the new
       scoring frame-work (digits_hits) and processes/scoring.
     - The following classes are removed:
       G4IStore, G4ParallelNavigator, G4ParallelStepper, G4ParallelWorld,
       G4VCellScorer, G4VCellScorerStore, G4VIStore, G4VParallelStepper, 
       G4VPGeoDriver, G4VScorer, G4ImportanceSplitExaminer, 
       G4VImportanceSplitExaminer, G4VWeightWindowExaminer, 
       G4WeightWindowExaminer
     - Classes are kept in the HEAD for testing purposes.

May 11th, 2007 G.Cosmo geombias-V08-03-00
     - Use call to G4GeometryTolerance instead of kCarTolerance constant in
       G4ParallelNavigator.
     - Requires tag "global-V08-03-00" and related tag set.

Nov, 9th 2005 G.Cosmo geombias-V07-01-00
     - Implemented migration to <sstream> for affected classes:
       G4ParallelNavigator and G4ImportanceAlgorithm.

Oct, 22nd 2003 G.Cosmo geombias-V05-02-03
     - Migrated calls to G4Exception to new scheme.

Sep, 30th 2003 G.Cosmo geombias-V05-02-02
     - updated GNUmakefile, according to new structure introduced
       in "geometry-V05-02-00".

Aug, 22th 2003 M.Dressel geombias-V05-02-01
     - got rid off G4ImportanceFinder 

Aug, 19th 2003 M.Dressel geombias-V05-02-00
     - first implementation of weight window technique

Jun, 4th 2003 G.Cosmo geombias-V05-01-00
     - Fixes for inclusion of <strstream> in G4ImportanceAlgorithm.cc and
       G4ImportanceFinder.cc in view  of the g4std wrappers migration.

Apt, 11th 2003 M.Dressel geombias-V05-00-03
     - implementation of "IsInWorld" in G4IStore using IsAncestor of
       G4LogicalVolume

Apr, 3rd 2003 G.Cosmo geombias-V05-00-02
     - Fixed few trivial strict pedantic warnings.

Mar, 27th 2003 G.Cosmo geombias-V05-00-01
     - G4ParallelNavigator.cc: set cout precision to 12 (was 50 !?!).

Mar, 24th 2003 M.Dressel geombias-V05-00-00
     - G4ParallelNavigator.cc: modified shift mechanism
       in ComputeStepLengthShifted().

Nov, 20th 2002 G.Cosmo geombias-V04-01-04
     - changed definition of G4NSplit_Weight from struct to class
       to allow porting on Windows DLLs.

Nov, 4th 2002 M.Dressel geombias-V04-01-03
     - remove G4std:: where it does not belong to, 
     - remove G4StringConversion,
     - and added G4Nsplit_Weight.cc

Oct, 28th 2002 M.Dressel geombias-V04-01-02
     - moving interfaces G4VCellScorer and G4VCellScorerStore back
 
Oct, 22th 2002 M.Dressel internal_7_geombias-V04-01-01
     - renaming G4VPScorer to G4VScorer and  
                G4PStep to G4GeometryCellStep 
     - moving interfaces G4VCellScorer and G4VCellScorerStore to intercoms
     - adding comments 

Oct. 16th 2002 M.Dressel internal_6_geombias-V04-01-01
     - changes recomanded by codewizard
     - stream, and string conversion from file G4Nsplit_Weight.hh/.cc
       to G4StringConversion.hh/.cc

Oct. 15th 2002 M.Dressel
     removing G4Pstring with G4StringConversion

Oct. 14th 2002 M.Dressel 
     cleanup according to codewizzard

Oct. 10th 2002 M.Dressel geombias-V04-01-01-internal-5
     change in G4(V)ImportanceAlgorithm, G4ImportanceSplitExaminer
     G4ImportanceFinder: give pre and post importance 
     separatly insted only ipre/ipost.

Sep, 2th 2002 M.Dressel geombias-V04-01-01-internal-4
     moved files concerning messaging a importance geometry to
     /afs/cern.ch/user/d/dressel/G4/IGeoMessangers.
     Support will be given on demand. 

Sep, 2th 2002 M.Dressel geombias-V04-01-01-internal-3
     code cleanup for code-wizard

Aug,  29th 2002 M.Dressel int-2-geombias-V04-01-01
     renaming of G4PTouchableKey to G4GeometryCell 
     changing  G4VIStore and G4IStore 
     and dependants

Aug,  13th, 2002 M.Dressel
  removed G4VPrintableScorer.hh G4VPrintableScorerFactory.hh

Aug,  13th, 2002 M.Dressel - geombias-V04-01-01
    added G4VCellScorer.hh and G4VCellScorerStore.hh

July, 18th, 2002 M.Dressel 
   change the strategy for importance sampling:
	- G4VIStore: new function:
		IsKnown(const G4PTouchableKey &ptk)
		to tell if a cell (G4PTouchableKey) is known in the
		store
	- no biasing is applied between cells that are not known by 
	  the G4IStore and it's neighbors.
	- importance valu 0 is allowed to flag that no biasing should
	  be done betweeen the cell and it's neighbors.
    change the G4PArallelNavigator: 
        - using G4TouchableHanle
        - and LocateGlobalPointAndSetup

	  
July, 11th, 2002 M.Dressel 
  added comments in new classes

July, 11th, 2002 M.Dressel - internal-2-geombias-V04-01-01
  added clases for contruction of a simple geometry with 
  importance values and messengers.

July, 10th, 2002 M.Dressel - internal-1-geombias-V04-01-01
 change in G4Sigma: the sum over the weights is returned by GetWsum 
 (before it was GetSumOfWeights) and the weighted sum over x is returned  
 by GetWXsum().


May, 31th, 2002  M.Dressel - geombias-V04-00-04
- change name ImportanceSampler to ImportanceSplitExaminer

May, 30th, 2002  M.Dressel
- change comments in WeightWindowAlgorithm

May, 24th, 2002  M.Dressel - internal-1-geombias-V04-00-02
- Added classes for weight window biasing. 


April 10th, 2002  M.Dressel - geombias-V04-00-03
- Added comments to header files for Software Reference Manual.

April 9th, 2002  G.Cosmo
- Added liability disclaimer to all files and minor cosmetics.

April 8th, 2002  M.Dressel - geombias-V04-00-02
- Resolved compilation problems on HP-aCC.

April 4th, 2002  M.Dressel - geombias-V04-00-01
- Resolved compilation problems on SUN-CC and Linux-egcs.

March 28th, 2002  M.Dressel - geombias-V04-00-00
- First implementation of importance biasing and scoring.

March 25th, 2002  G.Cosmo
- Created.
