Applied patch from Rob Richards, fixing a potential memory leak in
* xpath.c: Applied patch from Rob Richards, fixing a potential memory leak in xmlXPathTryStreamCompile(), when a list of namespaces was assigned to the XPath compilation context; here a new namespace list was created and passed to xmlPatterncompile(); but this list was not freed afterwards. Additionally we avoid now in xmlXPathTryStreamCompile() to compile the expression, if it has a colon - indicating prefixed name tests - and no namespace list was given. The streaming XPath mechanism needs a namespace list at compilation time (unlike normal XPath, where we can bind namespace names to prefixes at execution time). * pattern.c: Enhanced to use a string dict for local-names, ns-prefixes and and namespace-names. Fixed xmlStreamPushInternal() not to use string-pointer comparison if a dict is available; this won't work, since one does not know it the given strings originate from the same dict - and they normally don't do, since e.g. namespaces are hold on xmlNs->href. I think this would be worth an investigation: if we can add a @doc field to xmlNs and put the @href in to a additionan namespace dict hold in xmlDoc. Daniel will surely not like this idea :-) But evaluation of tons of elements/attributes in namespaces with xmlStrEqual() isn't the way we should go forever.
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