Modify LauIsobarDynamics::calcDPNormalisationScheme so that any narrow resonance regions are symmetrised appropriately if the DP is fully-symmetric, symmetric or is flavour-conjugate (and in this last case, symmetrisation of the integration has been forced via a new boolean function)

git-svn-id: svn+ssh://phab.hepforge.org/source/laurasvn/branches/timedep-branch@470 30227d83-a2f9-49e9-9e98-657c83b2c86a