remove extraneous field
Merge branch 'master' of https://github.com/mpi2/PhenotypeArchive

# By jwgwarren (2) and mrelac (1)
# Via jwgwarren (1) and mrelac (1)
* 'master' of https://github.com/mpi2/PhenotypeArchive:
  This change fixes the queries that populate the ma parent and child terms. It also adds methods to dump the ontology map terms.
  modfied MPIndexer so I can use it in the SangerImages indexer to get top level MA nodes...
  added mps and mp syns