genpdb ignores CA_only and backbone_only suffixes

If in params.py, CA_only and backbone_only are set to True, the fit.py would create directories with _CA_only and _backbone suffixes (e.g. fits_chimera_CAonly. See also: /g/kosinski/kosinski/T7SS/fitting for example.)

genpdb currently would not generate pdbs from those runs.

Shall we fix genpdb or rather change fit.py script by moving CA_only and backbone_only to fitmap_args groups?

I think the second option is more convenient in long-term.