hack based on Arjan van de Ven suggestion to reduce ELF footprint and

* elfgcchack.h doc/elfgcchack.xsl libxml.h: hack based on Arjan van de
  Ven suggestion to reduce ELF footprint and generated code. Based on
  aliasing of libraries function to generate direct call instead of
  indirect ones
* doc/libxml2-api.xml doc/Makefile.am doc/apibuild.py: added automatic
  generation of elfgcchack.h based on the API description, extended
  the API description to show the conditionals configuration flags
  required for symbols.
* nanohttp.c parser.c xmlsave.c include/libxml/*.h: lot of cleanup
* doc/*: regenerated the docs.
Daniel
diff --git a/doc/APIchunk2.html b/doc/APIchunk2.html
index 4288827..aed367e 100644
--- a/doc/APIchunk2.html
+++ b/doc/APIchunk2.html
@@ -360,6 +360,7 @@
 </dd><dt>Expr</dt><dd><a href="html/libxml-xpath.html#xmlXPathEvalPredicate">xmlXPathEvalPredicate</a><br />
 <a href="html/libxml-xpathInternals.html#xmlXPathEvaluatePredicateResult">xmlXPathEvaluatePredicateResult</a><br />
 <a href="html/libxml-xpointer.html#xmlXPtrEvalRangePredicate">xmlXPtrEvalRangePredicate</a><br />
+</dd><dt>Expresses</dt><dd><a href="html/libxml-uri.html#xmlBuildRelativeURI">xmlBuildRelativeURI</a><br />
 </dd><dt>Expression</dt><dd><a href="html/libxml-xpath.html#xmlXPathEvalPredicate">xmlXPathEvalPredicate</a><br />
 <a href="html/libxml-xpathInternals.html#xmlXPathEvaluatePredicateResult">xmlXPathEvaluatePredicateResult</a><br />
 </dd><dt>Extender</dt><dd><a href="html/libxml-parserInternals.html#IS_EXTENDER">IS_EXTENDER</a><br />