[CSS21] out-of-date references

Hello,

Many references in CSS 2.1 Last Call Working Draft are out of date.
I trust editors can figure out correct references by themselves, so
I only briefly describe which entry should be updated.

B.1 Normative references
http://www.w3.org/TR/2005/WD-CSS21-20050613/refs.html#q1

[COLORIMETRY]
  link broken
[CSS1]
  new edition available
[HTML40]
  new revision available
[IANA]
  RFC 1700 is replaced by an on-line database (see RFC 3232)
[ISO8879]
  link broken
[ISO10646]
  10646-1:1993 is way out of date, 10646:2003 is the latest version
[PNG10]
  new edition available
[RFC2068]
  obsoleted by RFC 2616
[UNICODE]
  new minor revision available

B.2 Informative references
http://www.w3.org/TR/2005/WD-CSS21-20050613/refs.html#q2

[DOM]
  it's a REC now
[MATH20]
  second edition available
[WAI-PAGEAUTH]
  it's a REC now
[XMLID]
  newer draft (PR) available

Regards,
-- 
Masayasu Ishikawa / mimasa@w3.org
W3C - World Wide Web Consortium