[tei-council] some attribute issues

[Syd Bauman]

* Both method= of <correction> and method= of <normalization> have a
  value "silent", but for the former the opposite is "markup", for
  the latter it is "tags".

* I hope I don't sound like a broken record, but the version=
  attribute of <TEI> is still declared as data.decimal. (Besides not
  doing cool things like pointing to the ODD, which IIRC James wants
  and is what derailed the conversation last time, this doesn't even
  permit "1.0.1", or "5.0.1" or "P5 1.0".)

* The example in the quotation tagdoc
  (http://tei.oucs.ox.ac.uk/P5/Guidelines-web-beta/en/html/ref-quotation.html)
  should use references to Unicode code points (e.g. "double curly
  quotation marks: U+201C and U+201D") instead of prose descriptions.
  While we're here, why is the default value of marks= of <quotation>
  "all"? This didn't make sense to me in P4, either.