Propagate HepMC event weights to EDM4hep and LCIO outputs of ddsim

[tmadlener]

BEGINRELEASENOTES

• Propagate HepMC event weights to EDM4hep and LCIO outputs of ddsim
  • Store all available weights and their names into the Frame / Event parameters, additionally store the first weight into the weight field of the edm4hep::EventHeader, resp. the LCEvent.
• Add a possibility to store double values in DDG4::EventParameters

ENDRELEASENOTES

Fixes #988

• Needs Add double to the supported types of GenericParameters podio#372

[tmadlener]

After this fix, the output of podio-dump -d example.edm4hep.root | tail -n25 looks like

float parameters
Key                           Value 
--------------------------------------------------------------------------------

double parameters
Key                           Value 
--------------------------------------------------------------------------------
EventWeights                  [1]

std::string parameters
Key                           Value 
--------------------------------------------------------------------------------
EventWeightNames              [0]
GenCrossSection               [2.64422551e+03 2.64422551e+03 -1 -1]
GenPdfInfo                    [11 -11 9.97420767e-01 9.99999975e-01 9.18812775e+01 1.56824725e+01 2.82148362e+06 0 0]
alphaQCD                      [0.129844]
alphaQED                      [0.007818181]
event_scale                   [91.88128]
mpi                           [0]
signal_process_id             [221]
signal_process_vertex         [0]

and root -l example.edm4hep.root -e 'events->Scan("EventHeader.weight")' produces

root [0] 
Attaching file example.edm4hep.root as _file0...
(TFile *) 0x55faabc41d60
***********************************
*    Row   * Instance * EventHead *
***********************************
*        0 *        0 *         1 *
*        1 *        0 *         1 *
*        2 *        0 *         1 *
*        3 *        0 *         1 *
*        4 *        0 *         1 *
*        5 *        0 *         1 *
*        6 *        0 *         1 *
*        7 *        0 *         1 *
*        8 *        0 *         1 *
*        9 *        0 *         1 *
***********************************
(long long) 10

So that it seems that all the necessary information is propagated to where it should be.

[tmadlener]

LCIO seems to have gained the double parameter capabilities with 2.17 only: https://github.com/iLCSoft/LCIO/blob/master/doc/ReleaseNotes.md#v02-17

[tmadlener]

Made both LCIO and EDM4hep only use the functionality when it is actually present. Had to work around AIDASoft/podio#374 for podio.