Getting things ready for backward Galveston run

Getting initialization set up for backward Galveston simulation. Have made various tweaks to other scripts too.
Ready for galv_b and outer_f projects

Separate python scripts are set up for running the backward Galveston (galv_b) and forward outer domain (outer_f) simulations. Initializations have been placed in gisr's init.py as well as setting up gisr's run.py with flags to choose what to run.