Fix hundreds of std=c++11 compiler warningsAllow to change compiler settings in cmake/DD4hep.cmake valid for all packages.Watch out for CMAKE_CXX_FLAGS in cmake/DD4hep.cmake.Move to use Boost spirit::phoenix version 3. ---- Prepare for ROOT 6

No code changes. Common code formatting removing tabs, replacing with spaces (tab-size=-2) + emacs reformatting.

Remove debugging items from CLICSiD compact xml. First implementation of Multipole magnetic field description. Add missing units in DDG4 LCIO conversion.

 - fixed generator status: set to 0 if
   particle created in simulation

Improved version of MC particle handler, fix calorimeter hit aggregation with multiple contributions

   such that other user actions can access it (e.g. for adding the MCParticle collection)