Merge pull request #4096 from RosettaCommons/roccomoretti/ignore_rna_loop_data
Ignore autogenerated loop files in the database.
There are some cached files in database/scoring/loop_close/6D_potentials/rna/ which get autogenerated (e.g. by unit tests)
Add them to a gitignore file, so they don't clutter up git status reports.