Change API to support for multiple trees in the query builder

[acwhite211]

This issue is an extension of #4979. This PR defines the new protocol in the QB API for specifying the treedefid of a rank. The new QB request schema for MOTs is <table_id>.<table_name>.<treedef_id>,,. The code is backwards compatible, so it still allows that old schema to be used. The front-end needs to be changed to send this new QB request schema when dealing with MOTs.

Testing:
TBD