* protect against self assignment
* delete NULL is a no-op, don't need to check

Create stringstream to avoid changing output format for cout

now phi bins are counted from the offset counter-clockwise up

use scientific format for float/double
correct the unsigned long and long format output (l is length specifier)

a) This (the one in Handle.h) is used to pass parameters to the Segmentations at the moment
b) I know 30 digits is overkill

 Update teveDisplay for better visualization resolution on Tube. For example TPC, Hcal outer shape and Coil.

Don't convert units when calling the setDimension internal function.
Otherwise conversion is applied twice when setDimensions calls _setDimensions

    Geometry::Volume createPlacedEnvelope( DD4hep::Geometry::LCDD& lcdd, DD4hep::XML::Handle_t e , DD4hep::Geometry::DetElement sdet ) ;

   shapes (subtraction, union or intersection ) 

This also now allows to skip events

   to be used to only build detector envelopes
 - fixed visualization in teve_display to also
   show the envelope volume
 - visualize daughter level in dumpdetector (tabs)

lower case vec is used in other parts of this file

   - angle arguments in sphere constructors 

   -> for debugging:
     - envelope is not visible in teveDisplay !
     - envelope is visible in geoDisplay but transparency is ignored ...

   no need for dedicated plugin to create volumes
   as we can also use shapes
 - added optional positioning to the SubdetectorAssembly_geo
   plugin for allowing envelopes to be placed

Fix typo in function name, change comment for function
Add setters using vectors

use the cellBoundaries based positionToBin and binToPosition functions

Treatment of edge cases (see comments in the code as well)
If we are close to the lower bound, we assume it is in the bottom
Include upper boundary to the segmentation
If the value is below or above the lowest or highest, throw exception, this means the segmentation is always bound by values we give it

Need to subtract 1 from the result, because upper_bound works that way

   envelope for subdetectors by calling a plugin that
   creates a volume
 - added factory methods for creating a volume from 
   an XML tag - to be used for envelope volumes