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

Conflicts:
	R/utilities.R
	man/lmer.Rd