track selection by the first/last hit position (copied older developments from 6_2_X branch)
write results of Lorentz Angle and Backplane corrections to split-iov db file
Merge pull request #2333 from mschrode/LABPinTkAl_71X

Alignment/CommonAlignmentProducer -- Update on Lorentz-Anlge and Backplane correction related developments (7_1_X)