make g77 versions of fortran for binwin2.7 - faster than gfortran!
fix to histogram2d.for
GSASII.py - allow 2D offset in multiplots, fix for large file lists
GSASIIimgGUI.py - more stuff in save/load controls
GSASIIplot.py - 2D offset in multiplots, fix bad behavior in structure drawings
GSASIIpwd.py - more mods to PDF calcs