ggfitStrata removes spaces from labels for strata

First of all thank you for writing this nice package!

I was wondering if it is really necessary to remove spaces from labels for strata in ggfitStrata.R as this makes the labels less legible in the grid plot? I took the source code and commented out:

`TempData$StrataC <- gsub(" ", "", TempData$StrataC)`

The modified function seems to work fine with the case I tested it with, but maybe the removal of spaces is meant to guard against something particular that did not play a role in the simple test I ran.

I noticed the note on use of `revalue`, but could not follow how that is supposed to work. Maybe an example or more detail would help.