Revert a33a69f..5be4d31

This rolls back to commit a33a69feea6795ee65479eee588f6b31bc529c6c.
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Merge branch 'master' of github.com:mostly-harmless/radiant

Conflicts:
	dev/quant/tools/analysis/regression.R
	inst/quant/tools/analysis/regression.R
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