Release v2r0 for Gauss v55r2
This release against LHCb v53(r1) needs to be made in order to release Gauss v55r2.
It uses the new cmake (mr !12 (merged)) where the required dependency is for 53.0. Version 53.1 for LHCb will be fixes in lhcbstack.
The version is 2.0/v2r0 due to the cmake incompatibility with the previous version.