revert to very old state to resynchronize pythia8 interface with 7x series
Merge pull request #775 from mkirsano/decay_tauolapp_pi0_sw7

Generators Fixes -- Fix decay pi0 after Tauola++ migration.
Merge pull request #1670 from mkirsano/Pythia8Int_fix2

Pythia8 int fix2
Merge pull request #2090 from mkirsano/migrate_pythia8_180_cmssw71X

Generators updates -- Migrate to pythia8 180
Conflicts:
	GeneratorInterface/Pythia8Interface/interface/P8RndmEngine.h
	GeneratorInterface/Pythia8Interface/src/Py8GunBase.cc
Merge pull request #2170 from bendavid/py8slhaReading

Py8slha reading
Conflicts:
	GeneratorInterface/Pythia8Interface/plugins/Pythia8Hadronizer.cc
Merge pull request #2565 from mkirsano/fix_residualdecay71

Generators updates -- Fix ResidualDecay port from 62X
Conflicts:
	GeneratorInterface/Pythia8Interface/plugins/Pythia8Hadronizer.cc
Merge pull request #2681 from smrenna/pythia8-check-ids

Pythia8 -- Check if Pythia8 recognizes the stable particles
Merge pull request #2645 from mkirsano/fix_residual_in_guns

Generators -- Fix residual decays for the guns
Merge pull request #3320 from mkirsano/topythia8185_71X

GeneratorInterface/Pythia8Interface -- Move to pythia8 185
Merge pull request #3328 from mkirsano/rapidityuserhooks_3

Generators -- Add rapidityuserhooks and some cleanup
bring old random number interface in line with pythia 8.18x
revert changes related to obsolete jet matching interface (the full backport of this might impact core pythia 6 jet matching)
Merge pull request #4463 from bendavid/py8matchingdev3

Jet Matching and Gridpack Updates for madgraph_amc@nlo + Pythia 8
Conflicts:
	GeneratorInterface/PartonShowerVeto/BuildFile.xml
Merge pull request #4479 from bendavid/py8matchingdev3

update xml attribute name for reading shower scales
Merge pull request #4532 from bendavid/py8matchingdev3

Last fix to lhe interface for mg_amc@NLO 2.1.2 compatibility
cleanup working directory when finished (to leave more space for additional job output in multistep workflows)
Merge pull request #4627 from bendavid/madgraphscalefix72x

Fix inconsistent reading of madgraph cluster scales (72x)
Merge pull request #4640 from lveldere/py8ptgun_fixes_partons_71

Py8ptgun fixes partons 71
Merge pull request #4961 from pgunnell/CMSSW_7_1_X

Pythia8CUEP8M1Settings_cfi.py (72x)
Merge pull request #5551 from bendavid/pythia8200pre2interface

Pythia8.200pre2 interface changes
Conflicts:
	FastSimulation/ParticleDecay/interface/PythiaDecays.h
	FastSimulation/ParticleDecay/src/PythiaDecays.cc