Reviewed by darin.

        Add incremental parsing support to XMLTokenizer.
        This patch also does a few other little things:
        - removes (unused) onHold support from Tokenizer
        - adds serialization of DOCTYPEs for xml documents
        - fixes xslt support to no longer depend on synchronous parsing
        - fixes css styling for pages where xsl recursion is blocked
        http://bugzilla.opendarwin.org/show_bug.cgi?id=6057

        * dom/DocumentImpl.cpp:
        (WebCore::DocumentImpl::DocumentImpl):
        (WebCore::DocumentImpl::createProcessingInstruction):
        (WebCore::DocumentImpl::open):
        (WebCore::DocumentImpl::recalcStyleSelector):
        * dom/dom_xmlimpl.cpp:
        (WebCore::ProcessingInstructionImpl::checkStyleSheet):
        * dom/xml_tokenizer.cpp:
        (WebCore::XMLTokenizer::XMLTokenizer):
        (WebCore::XMLTokenizer::write):
        (WebCore::XMLTokenizer::startElementNs):
        (WebCore::XMLTokenizer::error):
        (WebCore::XMLTokenizer::initializeParserContext):
        (WebCore::XMLTokenizer::finish):
        (WebCore::xmlDocPtrForString):
        (WebCore::parseAttributes):
        * dom/xml_tokenizer.h:
        * khtml/editing/markup.cpp:
        (khtml::startMarkup): DOCTYPE serialization
        * khtml/html/htmltokenizer.cpp:
        (WebCore::HTMLTokenizer::HTMLTokenizer): removed onHold
        (WebCore::HTMLTokenizer::reset): removed onHold
        (WebCore::HTMLTokenizer::begin): removed onHold
        (WebCore::HTMLTokenizer::write): removed onHold
        (WebCore::HTMLTokenizer::finish): removed onHold
        * khtml/html/htmltokenizer.h: removed onHold support
        * khtml/xsl/xsl_stylesheetimpl.cpp:
        (WebCore::XSLStyleSheetImpl::XSLStyleSheetImpl):
        (WebCore::XSLStyleSheetImpl::~XSLStyleSheetImpl):
        (WebCore::XSLStyleSheetImpl::document):
        (WebCore::XSLStyleSheetImpl::setDocument):
        (WebCore::XSLStyleSheetImpl::parseString):
        (WebCore::XSLStyleSheetImpl::loadChildSheets):
        (WebCore::XSLStyleSheetImpl::compileStyleSheet):
        (WebCore::XSLStyleSheetImpl::locateStylesheetSubResource):
        * khtml/xsl/xsl_stylesheetimpl.h: moved functions to .cpp file



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@12812 268f45cc-cd09-0410-ab3c-d52691b4dbfc