Added new Velo geometry. Some performance fixes.
- New Velo geometry is smaller and is all floats (before it was composed of some doubles). It has replaced the previous Velo geometry.
- Muon hits are now passed as a reference (+5% performance).
- Init event list had a bug by which only the first 1024 events would be correctly populated. This has been fixed.
- Several debug_cout were unprotected in the code in Velo visitors. All of them have become protected now (with an if).