Revert "Merge pull request #1046 from cms-sw/revert-1028-topythia8200pre1"
This is the revert of the revert of the pythia8 changes.

This reverts commit 086db1c9787641dc16c81e38efc7d15cca2e6fec, reversing
changes made to d04e9c853ede3f887552e9ee87925d2d3b5716e2.
update to pythia 8.200pre2 (still from tarball in generator afs area)
Merge pull request #1063 from bendavid/py8_200pre2_53x

Update to Pythia 8.200pre2 (53x)