Merge branch 'master' into commtrack
only include the latest open requisition per spp when approving/filling

- change default sort order of getting open requisitions to return recent
  first.
- add utility functions to get just referenced ids from commtrack models
no need to memoize ids
Merge pull request #247 from dimagi/commtrack-reqs

only include the latest open requisition per spp when approving/filling
enable requisitions by default
Merge pull request #248 from dimagi/commtrack-reqs

enable requisitions by default
Merge pull request #245 from dimagi/commtrack

commtrack fix bulk history import
clean up form filter ui
Merge branch 'form-field' into staging2