fix densityv1  : 1. change output format. 2. change processing time
improve the input format that can read flags
include a feature that can symmetrize the density
include a feature that can select z range for calculation. cutbox.py has been integrated in to sim2den.py
remove cutbox.py. This has been integrated into sim2dens.py
remove gdb debug line in sim2dens.py
Add lnx_until for parsing argument and print help document.
remove corresponding parts from densityv1.py and sim2dens.py
change formFactorv1.py and lnx_util.py