delete lumi based MEs when the LS processing is over
move LS histo removal in mergeAndResetMEsLuminositySummaryCache
add function markForDeletion to DQMStore
shrink down the markForDeletion function
fix invalid iterator
move markedToDelete and markToDelete to be private in the MonitorElement class
added a comment to the markToDelete method
Merge pull request #5834 from deguio/deleteMEafterWriting_v3_73x

DQMServices -- Delete ME after writing v3 73x
Merge remote branch 'origin/CMSSW_7_3_X' into CMSSW_7_0_X