Finish jet moments hypo

This finishes the current jet moment hypo.

I added three examples in SignatureDicts.py but no chain:

• Cut based on EMFrac: 050momemfrac100
• Cut based on HECFrac: momhecfrac010
• Cut based on EMFrac AND cut based on HECFrac: 050momemfrac100SEPmomhecfrac010

'mom' is used to know a moment hypo should be used

We could have momEMFrac and momHECFrac without the need of the JetMoment dictionary, but I would prefer to leave it like this since something like this is needed for moments with long names or complicated ones, we can add those to JetMoment and then for all the moments which are not listed there we can assume that whatever is after mom is the actual moment name.

This currently works only for simple jet moments, not if we want to look at a given index of a vector. If needed, I will take care of that later on.

@peter @khoo @valentem

Solves ATR-19909