Merge pull request #1 from georgebina/master

Comments and updates from George Bina: Fix the conflicting ID issue and review the Relax NG proposal
Responded to 13112 review comments from George Bina
RNG simplifier XSLT is producing output. May or may not be correct
Corrected (maybe) handling of rng:include
Removed temp files
Source for 13059a from Robert
First pass on RNG module implemented and tested
reference entries for dvr-* element types drafted
Deleted now-obsolete file.
TC review version of 13106
Latest PDF of 13001
Comments from Scott H. Corrected use of must, uppercase must, should, may
Comments from Dick H.
Added a:dtdURI and a:xsdURI attributes, normative and non-normative references
Draft of grammar for simplified grammars
Grammar normalization process correct as far as it goes, but not complete.
Choice processing appears to be correct
Normalization process is now correct. Contains-by tables closer to correct.