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DS-2607: Fix Random Forest with non-syntactic variable names (#10)

Random Forest doesn't allow dataset and variable/question references in their formulae. 
If such references exist, this fix strips off the dataset and variable references and does some 
basic tidying of back ticks for the variable names. This updates both the formula and variable 
names in the data.

* Fix RF with non-syntactic var. names; DS-2607

* Fix last commit; DS-2607

* Still may have non-syntactic char. in variable name after
stripping off data set

* Fix unit test; DS-2607

* Tidy up backticks present in var. names; DS-2607

* Add unit test; DS-2607

Co-authored-by: flipDevTools <opensource@displayr.com>

10 of 10 new or added lines in 1 file covered. (100.0%)

1031 of 1138 relevant lines covered (90.6%)

110.29 hits per line