re-introduce replaces which force DQM in production (in place of DQMio)
introduce --revertDqmio=yes/no to switch back to pool DQM in configuration sent to wmcontrol (DQMIO is untouched if chosen for local workflows)
U500by1 => U2000by1 , for HI MinBias only
Fix unused function warnings in 7_1_X gcc490.
Merge pull request #2662 from degano/fix_warnings_gcc490

GCC490 Fixes -- Fix unused function warnings in 7_1_X gcc490.
Merge pull request #2619 from franzoni/from-CMSSW_7_1_0_pre3_revertDQMIO_HIrecycle

Operations -- option in the matrix --revertDqmio  and HI min bias 2k
Merge remote branch 'origin/CMSSW_7_1_X' into CMSSW_7_0_X