Fixed a bug that was causing incorrect bin median values in 'hist'.
Significant clean-up of gbpCosmo.
Restructured the directory structure.
Created code for parsing paramter files. gbpCosmo can now initializes from a paramter file (default WMAP-5 parameter file created for init_cosmo_std()).
Added read-from-file cosmology support to all codes.
Improved on the default behavior of gbpCosmo and added easy shortcuts to WMAP-5 and WMAP-7 cosmologies.  Transfer functions are handled correctly now too.
Removed the poorly-implemented non-linear P(k) support.
Added make_mass_function executable (along with some edits to the mass_function routines).
Debugged mass function code.
Renamed all "select_and_analyze_treenode" references to "process_trees".