Getting note about scDatEx, but think it should be fine...

estimateSimpleParams -> simpleEstimate
estimateSplatParams -> splatEstimate

Neater than having a checkValid option

The splat sub function names were in the same format as the simulation names.
Changed to make it obvious they are different.

Should make sure they are actual outliers and better matches the estimation
method.

Rename old function to include group

Check that path.from has possible values

Need to do some more comparisons to check if these is the best approach...