Improve reading and writing of Simulation/Digitization parameters metadata
Improve reading and writing of Simulation/Digitization parameters metadata providing minimal read/write functions. Write is always write-only and if clients are there, read is also always needed.
Also IOVSvc.partialPreLoadData
is true by default.
Note that there are conflicts with 22.0 so maybe let's go only in master for this one.
/cc @jchapman