add skimming option in MPAF
finalize skimming options at basic level for SUSYSSDL class
last commit needed for skimming procedure
Merge branch 'MPAF_MMdev' of https://github.com/mmarionncern/MPAF into mmarionncern-MPAF_MMdev

Conflicts:
	cfg/sus-13-013_sr01_lowpt.cfg
Merge branch 'mmarionncern-MPAF_MMdev'