Fix most of the failing Tesla tests
The tests that are currently failing for me are:
- Tesla.default
- Tesla.z_FSRstream_Dimuon
- Tesla.z_FSRstream_Dstar
@rmatev is looking at 2 and 3. 1 is a bit weird and I need some more time with. I'm opening this MR before everything is fixed to get this in the nightlies.
Depends on LHCb!865 (merged).