updating filter tab layout

removing Marine Debris theme from Data Tab, adding those layers to
Filter Tab, adjusting the Filter Tab layout
preventing dynamic adjustments to filterLayers
styling the date range inputs
just a little work on the update filter button -- will wrap up later
fixing typos
adding marine debris types to Beach Cleanup filter

Update Filter button now includes date ranges and flat list of debris
types (still no ontology).
Currently using complete OpenLayers library - still need to rebuild
with Strategy class included (see changes to map.js).
Also limiting Fiter tab layers to Beach Cleanups (just to simplify
things for the moment -- see server.js).
adding ontology app with Term model

in preparation for the ontology implementation