2020-12-12 Boole v41r3

This version uses Lbcom v31r3, LHCb v51r3, Gaudi v34r1 and LCG 97a with ROOT 6.20.06.

This version is released on master branch. Built relative to Boole v41r2, with the following changes:

New features new feature

Fixes bug fix workaround

Enhancements enhancement

Code cleanups and changes to tests modernisation cleanup testing