Patch for compilation on Mavericks: 5a20b6cf9dbdf68958ebe2aae0ad5ced4a9a18d8

update to Vc 0.7.3-dev: 8ebcd0536e6eb67c689c290497891ac9b5b0e56a

merge from Vc: bd24bf8c2f3cbf81b200f99aceb8bcaf0ce3a289

fix libVc compilation: 86c94a996f784285aec18d4abdc04dd0e45c95ed

from Laurent Aphecetche, fixed compilation with clang: df57b24471f4ea911cc2ebd5570419ab3e5b329a

Option to switch pi0 decay off: 6b29a6daf168efa3bda0ea6ca8616fb602cf2332