moving sector-map view behavior into separate functions
fixing bug where map is not drawn when switching from facility,overview to summary,overview
using lga.variableSet instead of NMIS.variables
abstracted out common functionality into "_fetchModuleOnce" so that all LGA data modules are only fetched once per page load
using district data fetching shortcuts and slowly abstracting facility view callbacks into their own functions so they can be used more appropriately.
closure scoping NMIS.activeSector
isolating map-drawing actions in facilities.coffee