Fix to allow assigning of variables without types

This was a problem in the custom model builder for the ANOVA
Fix to memory leak
Fix to Independent Samples T-Test

Will now accept nominal text as a grouping variable
Changed OSX to use an R.framework
Fix to R location regression on windows and linux
Launching of engine subprocesses happens later

Leads to faster start up times
Tidy up

removal of unused code
Fix to Bayesian ANOVA form

modelTerms is now handled correctly