Add support for commented or empty .key lines

Also updated display key text for LCC / LCS files
New images, updated .gitignore
Fix binary reading

Binary read is still disabled but at least works.
reading and saving cellSize and corner x,y (even though we don't
clearly need it just yet)
New Assumptions setup
Cleaning out some old SendBack crufts
Add base for getting assumptions data/list from server

TODO: should read assumptions.dat file
Query Layers populate from Scenario list/table