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/APIchunk23.html b/doc/APIchunk23.html
index 54ba552..8a6deae 100644
--- a/doc/APIchunk23.html
+++ b/doc/APIchunk23.html
@@ -61,7 +61,8 @@
 <a href="html/libxml-parser.html#XML_DETECT_IDS">XML_DETECT_IDS</a><br />
 <a href="html/libxml-parser.html#XML_SKIP_IDS">XML_SKIP_IDS</a><br />
 <a href="html/libxml-HTMLparser.html#_htmlElemDesc">_htmlElemDesc</a><br />
-</dd><dt>tells</dt><dd><a href="html/libxml-xmlreader.html#xmlTextReaderPreservePattern">xmlTextReaderPreservePattern</a><br />
+</dd><dt>tells</dt><dd><a href="html/libxml-xmlreader.html#xmlTextReaderPreserve">xmlTextReaderPreserve</a><br />
+<a href="html/libxml-xmlreader.html#xmlTextReaderPreservePattern">xmlTextReaderPreservePattern</a><br />
 </dd><dt>temporary</dt><dd><a href="html/libxml-valid.html#_xmlValidCtxt">_xmlValidCtxt</a><br />
 <a href="html/libxml-xpath.html#_xmlXPathContext">_xmlXPathContext</a><br />
 <a href="html/libxml-xmlIO.html#xmlIOHTTPOpenW">xmlIOHTTPOpenW</a><br />
@@ -85,6 +86,7 @@
 <a href="html/libxml-xmlmemory.html#xmlStrdupFunc">xmlStrdupFunc</a><br />
 </dd><dt>termination</dt><dd><a href="html/libxml-xmlstring.html#xmlStrcat">xmlStrcat</a><br />
 <a href="html/libxml-xmlstring.html#xmlStrdup">xmlStrdup</a><br />
+</dd><dt>terms</dt><dd><a href="html/libxml-uri.html#xmlBuildRelativeURI">xmlBuildRelativeURI</a><br />
 </dd><dt>test</dt><dd><a href="html/libxml-parserInternals.html#xmlParserHandleReference">xmlParserHandleReference</a><br />
 <a href="html/libxml-xpathInternals.html#xmlXPathEqualValues">xmlXPathEqualValues</a><br />
 <a href="html/libxml-xpathInternals.html#xmlXPathNotEqualValues">xmlXPathNotEqualValues</a><br />
@@ -192,7 +194,8 @@
 <a href="html/libxml-threads.html#xmlIsMainThread">xmlIsMainThread</a><br />
 <a href="html/libxml-catalog.html#xmlLoadCatalog">xmlLoadCatalog</a><br />
 <a href="html/libxml-catalog.html#xmlLoadCatalogs">xmlLoadCatalogs</a><br />
-</dd><dt>through</dt><dd><a href="html/libxml-parser.html#xmlCreatePushParserCtxt">xmlCreatePushParserCtxt</a><br />
+</dd><dt>through</dt><dd><a href="html/libxml-uri.html#xmlBuildRelativeURI">xmlBuildRelativeURI</a><br />
+<a href="html/libxml-parser.html#xmlCreatePushParserCtxt">xmlCreatePushParserCtxt</a><br />
 <a href="html/libxml-parserInternals.html#xmlDecodeEntities">xmlDecodeEntities</a><br />
 <a href="html/libxml-uri.html#xmlNormalizeURIPath">xmlNormalizeURIPath</a><br />
 </dd><dt>thumblers</dt><dd><a href="html/libxml-debugXML.html#xmlShellPwd">xmlShellPwd</a><br />