- Implemented possibility to write the delta AOD's in a subdirectory of the folder...

- Implemented possibility to write the delta AOD's in a subdirectory of the folder containing the standard AOD:
   plugin->SetOutputSingleFolder("deltas")
If the input file is:
   /alice/sim/.../AOD/001/032/AliAODs.root
Then the outputs for each delta AOD job will go to:
   /alice/sim/.../AOD/001/032/deltas/AliAODs.root
- Added possibility to request other external packages than root, aliroot and gapi:
e.g.   plugin->AddExternalPackage("VO_ALICE@fastjet::v2.4.0")
- Included libMinuit.so to common loaded libraries