Switch to integrating in square DP when narrow resonances are found in m12. Basic implementation is there, so oktotest #65. Once verified, need to add handles (or reuse existing ones) to tune grid size etc.

git-svn-id: svn+ssh://phab.hepforge.org/source/laurasvn/trunk@308 30227d83-a2f9-49e9-9e98-657c83b2c86a