Grammar update for leading digits in localnames

rq25 has been updated for leading digits in the localnames or prefixed names. 
  At the same time, I did some renaming to not use "NCNAME" or "QName" to 
avoid confusion as we do not (and never did) exactly follow these terms in 
every detail.

A side effect is that blank node labels can start with dgits.  _:1 is alegal 
blank node by label.  The label is a local part or a prefixed name so I 
carried that over as well (strictly, I did nothing about it to stop it) for 
consistency.

Please check rq25 - it's very easy to get this wrong even though all th syntax 
tests still pass and my own tests had one change in a test that was 
specifically testing for this feature.

	Andy

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