Merge pull request #4044 from RosettaCommons/revert-4004-vmullig/threadsafe_options_system
Revert "Make the options system threadsafe"
Reverts #4004
@lyskov found that there were problems with the PyRosetta tests with this PR. I need to fix them and remerge. Please be aware that the options system is not threadsafe in the meantime.