Providing help with annoying weight names

There are some generators that produce names that have spaces in them. That can be quite frustrating for analysers that are even clever enough to print out the weightnames, since they don't quite match what's in the derivation. This puts out a warning in case the match is off by some spaces, but still allows the event to continue (so that users can fix their code).

This also helps with case differences ("nominal" vs "Nominal").

The default behavior is unchanged, and the slower checks only take place if the quick check fails.

Both checks are via boost helper functions.

FYI @lcorpe