v2.2.8-alice1

• v2.2.8-alice1 = update in ALICE to reach v2.2.8 of SHERPA
  with the intent to have :

  . Link against LHAPDF6
  . Add dependency on openloops (needed for NLO matrix element calculation) - needs new repository and build recipe
  . Add dependency on fastjet (needed for kinematic cuts when running dijet processes)
  . Enable SHERPA python API

• enable Openloops v2.1.0 for matrix element computation

See Pull request "SHERPA to v2.2.8, import OpenLoops" : alisw/alidist#2072