Add channelID to TTVELOClusters

Daniel Johnsonrequested to merge
johndan-extendtupletool into run2-patches

Extend TupleToolVELOClusters to save not just the sensor ID but the more useful channelID information. See https://lhcb-doxygen.web.cern.ch/lhcb-doxygen/lhcb/v42r10/d8/de1/class_l_h_cb_1_1_velo_channel_i_d.html

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