"Clear mappings" implicitly rejects proposed, too.
"Clear mappings" implicitly rejects proposed, too.

In all cases where we offer to "clear mappings", this should also
clobber any proposed mapping for an OTU. Fixes #438.

OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree,OpenTreeOfLife/opentree