Merge pull request #3538 from RosettaCommons/roccomoretti/move_parse_tag_checks_to_apply
Move pose-dependent initializations from parse_my_tag() to apply()
Another sub-PR of the parse_my_tag interface change PR #2466
There's a number of Movers/Filters which do work (initialization/sanity checks) in their parse_my_tag which can be deferred to apply().