Set up the Title fields directly in Title::makeTitle(), skipping the

Set up the Title fields directly in Title::makeTitle(), skipping the
secureAndSplit() step. This saves a lot of time and memory when working
with titles that are known-good (coming out of the database or other
Title objects, for instance).

Warning: if you feed invalid input to makeTitle() it will *not* be
checked for validity anymore and may do bad things. Don't do that.