Log Message:
Update to 2.7.3:

2.7.3: Jan 18 2009

    * Build fix: fix build when HTML support is not included.
    * Bug fixes: avoid memory overflow in gigantic text nodes,
    indentation problem on the writed (Rob Richards), xmlAddChildList
    pointer problem (Rob Richards and Kevin Milburn), xmlAddChild
    problem with attribute (Rob Richards and Kris Breuker), avoid
    a memory leak in an edge case (Daniel Zimmermann), deallocate
    some pthread data (Alex Ott).
    * Improvements: configure option to avoid rebuilding docs
    (Adrian Bunk), limit text nodes to 10MB max by default, add
    element traversal APIs, add a parser option to enable pre 2.7
    SAX behavior (Rob Richards), add gcc malloc checking (Marcus
    Meissner), add gcc printf like functions parameters checking
    (Marcus Meissner).