Merge pull request #939 from RosettaCommons/vmullig/fix_cassie_issue
Add a unit test illustrating a current issue with params files]
This merge will create a FAILING unit test, deliberately. This is to illustrate a current bug: recent changes have broken backwards-compatibility with custom params files provided by users. It seems that the L_AA property is required for the test params file to work; without it, it cannot be used.
Currently, reading a PDB file with a custom residue specified in a params file passed with the -extra_res_fa flag doesn't work if the params file doesn't specify D_AA or L_AA in its PROPERTIES line. I'll let those who are more familiar with the relevant code fix this; for now, this unit test will fail since this bug is unfixed.