Fix directory structure for lhapdf6 and some improvements
Merge pull request #1059 from mkirsano/lhapdf6_fix_structure_72

Fix directory structure for lhapdf6 and some improvements
Merge remote branch 'origin/IB/CMSSW_7_2_X/stable' into IB/CMSSW_7_0_X/stable
Merge remote branch 'origin/IB/CMSSW_7_3_X/stable' into IB/CMSSW_7_0_X/stable