removed some outdated materials
corrected FilePath for case of no path, i.e., the current directory
added Material.h .cpp
clean up for better consistency between 2D and 3D models
rearranged 2D/3D materials lists
fixes to atomistic
small updates
moved build message
version change to 3.4 and move to relative paths for external files
allow comment characters in batch files and use relative paths
