WIP
Merge branch 'master' into 85383-case
WIP
Merge branch 'master' into 85383-case

Conflicts:
	corehq/apps/commtrack/models.py
Added 'program-based filtering' in CommTrack
Merge branch 'master' into 85383-case
removed unnecessary code
Add case status filter

Still needs to be added to reports loaded from snapshots
Merge branch 'master' into 85383-case
Removed debugging lines and cleared the code
add filter to beneficiary report
Merge branch 'master' into 85383-case
Code refactoring - merged duplicated code
Merge remote-tracking branch 'origin/master' into opm_filter
support calculate expressions for xpaths in case details
use .form instead of .get_form throughout
Don't load snapshot when filtering by case status.
Switch to use the existing open/closed filter
Move case status filter to the bottom
rename couchforms.models.get