Add lhapdf6 tool with its dependency keeping it inactive
Merge pull request #1076 from smuzaffar/IB/CMSSW_5_3_X/stable

updated pythia8 to 200pre2
Merge pull request #1075 from mkirsano/add_lhapdf6

Add lhapdf6 tool with its dependency keeping it inactive
relocate bin/cython and bin/cygdb to use python from path