continuing improvements in X3dToPython.xslt conversions
silence debug diagnostics
better handling of mixed comments and mixed Metadata nodes within MetadataSet
handle Collision children= field declaration after proxy
multiple refinements
explicit handing of MetadataSet child nodes
MetadataSet child nodes: put Metadata node with containerField=metadata prior to those with containerField=value
numerous refinements and some refactoring to get field names working correctly