added Facility Wise Follow Up Report (incomplete)
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
making sure site_number key is always stored as a string
adding region filters to report
reorganising code. moving report class to different module (from data summary to field management)
Merge branch 'master' into fida-reports

Conflicts:
	hsph/__init__.py
	hsph/reports/field_management.py
fixing typo. removed 'base'  class DataSummaryReport(CustomProjectReport, ProjectReportParametersMixin, DatespanMixin), and have subclass directly inherit from respective superclasses instead of DataSummaryReport
reverting SiteField.getFacilities() to original implementation. Making consequent change in the new FacilityWiseFollowupReport
use form.date_admission rather than form.opened_on as date for filtering report
Merge pull request #27 from tsinkala/fida-reports

Fida reports