Geometry Description Markup Language 2.9.0

Geometry Description Markup Language (GDML) workpackage is primarly ment to provide geometry data exchange format for the LCG applications. The workpackage consists of the GDML Schema part, which is a fully self-consistent definition of the GDML syntax and the GDML I/O part which provides means for writing out and reading in GDML files.
The GDML Schema does not depend in any way on the GDML I/O packages. In particular, new extensions to the GDML I/O packages can be implemented (interfaces to new application, like for instance visualisation, editors, etc), while the GDML Schema definition remains unchanged.
Enhancements:
- The loop machinery was improved so that any volume can be used in a loop.
- An installation script was added along with support for auxiliary volume information.
- A SimpleExtension example that shows how to extend GDML with custom elements was added.
- The obsolete PyGDML package was removed.