Clearer status message in moveToEvent functions, change verbosity for particle printout in HepMC, add comment

use m_currEvent everywhere
move skipEvent logic to moveToEvent

  as using direct access always requires runNum==0 and sequential evt nums ...

This also now allows to skip events

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.