new keywords and new features for old keywords

keyword	meaning	range	default	type	remarks
rndm_seed	value of the seed for random generation	0, infinity	0	long int
do_bhabhas	bhabha treatment	0, 1	0	int
track_secondaries*	tracking of secondaries (pairs, bhabhas, compton...)	0, 1	0	int
store_secondaries	storing initial and final secondaries (pairs, bhabhas, compton...)	0, 1	0	int
load_beam	loading beams from electron.ini and positron.ini files	0 or 3 (PLACET)	0	int
cuts_from_loaded_beam	calculate grid cuts from actually loaded beam	0,1	0	int	if load_beam = 1; beam supposed to beam rather gaussian
cut_x_factor	value of cut_x in units of sigma_x	0., infinity	3.0	double	cut_x = cut_x_factor*sigma_x
cut_y_factor	value of cut_y in units of sigma_y	0., infinity	3.0	double	cut_y = cut_y_factor*sigma_y
cut_z_factor	value of cut_z in units of sigma_z	0., infinity	3.0	double	cut_z = cut_z_factor*sigma_z
bmt_precession	compute the depolarization due to BMT precession	0, 1	0	integer
polar_x		0., 1.	0.	double	effective only if bmt_precession
polar_y	components of the initial polarization vector	0., 1.	0.	double	see release note 1.0.5
polar_z		0., 1.	1.	double	for use

• replaces old keyword track_pairs, output file : secondaries.dat (in place of pairs.dat)

replaces old keyword store_pairs; output files : secondaries0.dat and secondaries.dat