Herwig7_i: powhegHerwigBB4L shared lib for H7 showering of bb4l LHE
This merge request should provide the bb4l (POWHEG-BOX-RES) Herwig7 matching. For this, we were provided source code by Silvia Ferrario Ravasio, which should be compiled as a shared library and then read in during the Herwig execution by specifying the shared library in the Herwig .in card. More details are given in AGENE-2282.