allow disabling of cumulative queries
use proper buckets for non cumulative queries and optimize
add active mobile workers report
Merge branch 'commconnect-reports' into active-mobile-workers-merge+commconnect-reports

Conflicts:
	corehq/apps/hqadmin/reports.py
Merge pull request #4181 from dimagi/active-mobile-workers-merge+commconnect-reports

active mobile workers report