Update properties used for OTU mapping (ongoing)
Update mapped-OTU tallies and study-quality test.
Add ^ot:altLabel logic, remove old obervers etc.

This reduces a lot of JS complication in the OTU mapping UI, while
retaining the old behavior.
Scrub empty/unused OTU altLabels before saving

These should be removed IF
    - otu is successfully mapped to OTT
    - altLabel it's empty (or just whitespace)
    - altLabel matches originalLabel
Removed old editedOTULabels (no longer needed)

This has been superceded by persistent ^ot:altLabel properties and
associated behaviors on their edit fields.
Merge pull request #285 from OpenTreeOfLife/revised-otu-mapping

Revised OTU-mapping UI