print( <mer> )  now differs  from
print( summary( <mer> ) )   in a way similar to  lm(.)
More print() / print(summary(.)): print() only does "Std.Dev."
but both print() option have a 'ranef.comp' argument for user choice.
Cleanup in formatVC() etc:  useScale should not be an argument
Using vapply(*, length, .) instead of sapply(*, length) / unlist(lapply()) a bit