release/21.5.6

Pedro Teixeira-Dias

@pedro

2c50d380 · Merge branch 'updateTrigMC_to_21.1.31_and.21.0.73' into '21.0-TrigMC' · Jul 06, 2018

This is a release from the 21.5.6 from the TrigMC branch, requested by John Baines, that will be used for FTK MC production.