add linked dctl to fida filter

(don't use until groups get set up on prod)
don't break on malformed fixture items (Case:61333)
Merge pull request #19 from dimagi/malformed-fixtures

don't break on malformed fixture items (Case:61333)
fix data references in report template
display correct relative apneic intervention percent
Merge pull request #20 from dimagi/fada-observations

small fixes
added Facility Wise Follow Up Report (incomplete)
add new version of fida performance report (Case:48615)
adding option to filter by Team Leader, Fida. added calculation for field "open cases"
using opened_on as date for filtering all indicators with report date range
Merge pull request #21 from dimagi/fida-performance

add new version of fida performance report (Case:48615)
add new modified version of case report for hsph-dev/betterbirth-pilot-2 (Case:50737)
Merge pull request #22 from dimagi/case-report

add new modified version of case report for hsph-dev/betterbirth-pilot-2...
add facility registrations report (Case:48612)

update of former Field Data Collection Activity Report
merge master
fix sorting of some numeric columns
making sure site_number key is always stored as a string
remove unused linked user filter that's going to be replaced by a generic one
adding region filters to report
merge master