First stab at identifying dataset from image names

This uses the parse package.  It does work, but I may refactor to used
named groups in regexps to avoid the dependency, since parse is not in
the standard library.
Switch from parse module to re module
Finish changes to short_image_name()
Finish universalizing FITS data paths
Add documentation of programs
Merge branch 'devel'

Conflicts:
	read-shapes-LL/misc_utils.py