grid_coords rewrite. Edge cases R hard.
grid_coords rewrite. Edge cases R hard.

this should squash the bug from rounding glitches.

agoldst/dfr-browser,joncgoodwin/dfr-browser,altaf-ali/dfr-browser,joncgoodwin/dfr-browser,agoldst/dfr-browser,agoldst/dfr-browser,altaf-ali/dfr-browser,agoldst/dfr-browser,joncgoodwin/dfr-browser,altaf-ali/dfr-browser,altaf-ali/dfr-browser,joncgoodwin/dfr-browser,joncgoodwin/dfr-browser