adding selected chain-aware online monitoring folders
Added the possibility of online monitoring b-tagging weights for selected HLT chains. Those are stored in dedicated folders, one for each selected HLT chain. As a starter this is done for two chains, HLT_j275_0eta290_020jvt_pf_ftf_bdl1r60_L1J100 and HLT_e26_lhtight_ivarloose_2j20_0eta290_020jvt_pf_ftf_boffperf_L1EM22VHI ATR-20301