Refactored group selection for regressions using data.multiGroupXYSelector
Bad Rubocop, bad!
Removed extraneous fullData member variable, clipping now occurs once in call to multiGroupSelector
Merge branch 'master' of https://github.com/isenseDev/rSENSE into jk_regressions
Merge pull request #1785 from JKinsman/jk_regressions

Regression tools now filter based upon group selection