EventDisplay Coordinates

Users specify which local transform to apply to global coordinates (which frame is the global one, really universe ?) by means of DE (detector element) names starting /dd/Structure/...

In order to make sense of any such coordinates (eg to display ntuple/histogram content within the 3D representation) need to have access to the G4AffineTransforms for all DE. Currently the IDMAP machinery only caches transforms for cathode volumes with PmtId attached.

TODO:

1. during geometry traverse already constructing G4TouchableHistory for every volumes
2. harvest G4AffineTransform for all DE obtained with TH2DE into a persistable map keyed on DE name, similar to G4DAETransformCache perhaps G4DAETransformMap

All DE are traversed by:

[blyth@ntugrid5 ~]$ which de.sh
~/env/bin/de.sh