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/APIchunk25.html b/doc/APIchunk25.html
index 2cd53e5..89760a7 100644
--- a/doc/APIchunk25.html
+++ b/doc/APIchunk25.html
@@ -105,6 +105,7 @@
 <a href="html/libxml-encoding.html#xmlCharEncInFunc">xmlCharEncInFunc</a><br />
 <a href="html/libxml-encoding.html#xmlCharEncOutFunc">xmlCharEncOutFunc</a><br />
 </dd><dt>xmlBufferPtr</dt><dd><a href="html/libxml-xmlwriter.html#xmlNewTextWriterMemory">xmlNewTextWriterMemory</a><br />
+</dd><dt>xmlBuildURI</dt><dd><a href="html/libxml-uri.html#xmlBuildRelativeURI">xmlBuildRelativeURI</a><br />
 </dd><dt>xmlCatalogAllow</dt><dd><a href="html/libxml-catalog.html#xmlCatalogGetDefaults">xmlCatalogGetDefaults</a><br />
 </dd><dt>xmlCatalogPtr</dt><dd><a href="html/libxml-catalog.html#xmlNewCatalog">xmlNewCatalog</a><br />
 </dd><dt>xmlCatalogResolvePublic</dt><dd><a href="html/libxml-catalog.html#xmlCatalogGetPublic">xmlCatalogGetPublic</a><br />
@@ -354,8 +355,7 @@
 </dd><dt>xmlSAX2StartElement</dt><dd><a href="html/libxml-SAX.html#startElement">startElement</a><br />
 </dd><dt>xmlSAX2UnparsedEntityDecl</dt><dd><a href="html/libxml-SAX.html#unparsedEntityDecl">unparsedEntityDecl</a><br />
 </dd><dt>xmlSAXVersion</dt><dd><a href="html/libxml-SAX2.html#xmlSAXDefaultVersion">xmlSAXDefaultVersion</a><br />
-</dd><dt>xmlSaveOptions</dt><dd><a href="html/libxml-xmlsave.html#xmlSaveToBuffer">xmlSaveToBuffer</a><br />
-<a href="html/libxml-xmlsave.html#xmlSaveToFd">xmlSaveToFd</a><br />
+</dd><dt>xmlSaveOptions</dt><dd><a href="html/libxml-xmlsave.html#xmlSaveToFd">xmlSaveToFd</a><br />
 <a href="html/libxml-xmlsave.html#xmlSaveToFilename">xmlSaveToFilename</a><br />
 <a href="html/libxml-xmlsave.html#xmlSaveToIO">xmlSaveToIO</a><br />
 </dd><dt>xmlSetExternalEntityLoader</dt><dd><a href="html/libxml-SAX.html#resolveEntity">resolveEntity</a><br />
@@ -378,8 +378,8 @@
 <a href="html/libxml-xmlreader.html#xmlReaderNewWalker">xmlReaderNewWalker</a><br />
 <a href="html/libxml-xmlreader.html#xmlTextReaderCurrentDoc">xmlTextReaderCurrentDoc</a><br />
 <a href="html/libxml-xmlreader.html#xmlTextReaderCurrentNode">xmlTextReaderCurrentNode</a><br />
-<a href="html/libxml-xmlreader.html#xmlTextReaderPreserve">xmlTextReaderPreserve</a><br />
-</dd><dt>xmlTextReaderCurrentDoc</dt><dd><a href="html/libxml-xmlreader.html#xmlTextReaderPreservePattern">xmlTextReaderPreservePattern</a><br />
+</dd><dt>xmlTextReaderCurrentDoc</dt><dd><a href="html/libxml-xmlreader.html#xmlTextReaderPreserve">xmlTextReaderPreserve</a><br />
+<a href="html/libxml-xmlreader.html#xmlTextReaderPreservePattern">xmlTextReaderPreservePattern</a><br />
 </dd><dt>xmlTextReaderLocatorPtr</dt><dd><a href="html/libxml-xmlreader.html#xmlTextReaderLocatorBaseURI">xmlTextReaderLocatorBaseURI</a><br />
 <a href="html/libxml-xmlreader.html#xmlTextReaderLocatorLineNumber">xmlTextReaderLocatorLineNumber</a><br />
 </dd><dt>xmlTextReaderRead</dt><dd><a href="html/libxml-xmlreader.html#xmlTextReaderExpand">xmlTextReaderExpand</a><br />