met uncertainty tool (in PAT) fixes for 72X releases

The MET uncertainty tool in PAT has been updated accordingly to the last development changes in 72X releases, and can go to the central release now.

Pat MET names have been also updated in order to match the new naming convention.

Matthieu

It was intentional, but maybe wrong. We did not have ak4 jet energy corrections three weeks ago in global tags, did it changed?
If so, then I will correct the file.