pythonPackages.pyhepmc: refactor move to python-modules

added tests

pkgs/development/python-modules/pyhepmc/pyhepmc_export_flow.patch

@@ -0,0 +1,20 @@
+diff --git a/hepmc/hepmcwrap.i b/hepmc/hepmcwrap.i
+index cf35c1b..b94fbe2 100644
+--- a/hepmc/hepmcwrap.i
++++ b/hepmc/hepmcwrap.i
+@@ -1,6 +1,7 @@
+ %module hepmcwrap
+ 
+ %{
++  #include "HepMC/Flow.h"
+   #include "HepMC/GenEvent.h"
+   #include "HepMC/GenVertex.h"
+   #include "HepMC/GenParticle.h"
+@@ -93,6 +94,7 @@ namespace HepMC {
+ // headers before importing headers that use those classes.
+ // Result is that headers should probably be %included in an order
+ // which sees "contents before containers"
++%include "HepMC/Flow.h"
+ %include "HepMC/HepMCDefs.h"
+ %include "HepMC/SimpleVector.h"
+ // #ifdef HEPMC_HAS_ITERATOR_RANGES