Fixed bug on working from an unsaved vt.
Merge branch 'parallelRModules' of git@github.com:ColinTalbert/sahm.git into parallelRModules

Conflicts:
	utils.py
Working on setting up a function that will
look for each of our input files relative to
a variety of places and taking the first existent
matching named file it finds.
1st is relative the current .vt file.
2nd is relative to the current SAHM session folder
last just returns the filename as is.
Check of Model input MDS to not allow
covariate names that break the R
models.