patch applied (packages/HaXml): new exports openElemTag/openCloseTag, and document all exported parsers.

[Malcolm Wallace]

Tue Jan 31 09:17:47 PST 2006  Malcolm.Wallace at cs.york.ac.uk
  * new exports openElemTag/openCloseTag, and document all exported parsers.
  The mini-parsers for openElemTag and closeElemTag are needed for stream-based
  parsers to continue without waiting for everything in between.

    M ./src/Text/XML/HaXml/Parse.hs +34