update names of features only for `mlr` interface
the names that are created by make.names()
can be very confusing to read, since e.g.
Dialister mOTU [0012]
turns into Dialister.mOTU..0012.
which is not nice as labels for plots.
I therefore propose to use the native names throughout all functions of the package and to update the names just before the data are given to mlr
and update them again once they need to be extracted out of the model.