added unit test for xy (not spherical coords) case which works
readgrid does not include a basemap object if not using spherical coordinates now
working to eliminate instances where it is assumed user wants spherical coordinates
added another case for changing from grid indices to projected space instead of spherical
changed scripts so that usespherical is read in from grid file instead of input
tweak to spherical reading in
changed assumption that tracks are saved in tracks directory
updated README with link to octant
added usespherical back in as an explicit parameter instead of being read in, for now
updated saved histogram for user manual. I think the binning got shifted somewhere
typo in readme formatting
added some options for 3D runs
adjusted for running in 3D. it now at least runs, but has not been tested much
cleaned up code a bit --- mostly comments but some small tweaks too
added MIT license file in anticipation of release
added doi to readme