first working version with completed network specs tables

Merge pull request #11 from Alexander-M-Waldman/master

First updates to original StreamHiker release

First public pre-release

Inlcudes gui for inputting specs and running program, main12a.py for setup and calling modules, sh_modules12a.py, and fortran executables (makefile12.exe, reachsplitterv12.exe, reachneighborsv12.exe and watershedhikerv12.exe)