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/APIchunk20.html b/doc/APIchunk20.html
index cbf194e..add7cc9 100644
--- a/doc/APIchunk20.html
+++ b/doc/APIchunk20.html
@@ -140,6 +140,7 @@
 <a href="html/libxml-parser.html#xmlParseBalancedChunkMemoryRecover">xmlParseBalancedChunkMemoryRecover</a><br />
 <a href="html/libxml-parser.html#xmlParseExternalEntity">xmlParseExternalEntity</a><br />
 </dd><dt>phase</dt><dd><a href="html/libxml-xmlregexp.html#xmlRegNewExecCtxt">xmlRegNewExecCtxt</a><br />
+</dd><dt>pic1</dt><dd><a href="html/libxml-uri.html#xmlBuildRelativeURI">xmlBuildRelativeURI</a><br />
 </dd><dt>piece</dt><dd><a href="html/libxml-tree.html#xmlNewChild">xmlNewChild</a><br />
 <a href="html/libxml-tree.html#xmlNewDocNode">xmlNewDocNode</a><br />
 <a href="html/libxml-tree.html#xmlNewDocNodeEatName">xmlNewDocNodeEatName</a><br />
@@ -284,6 +285,7 @@
 <a href="html/libxml-tree.html#xmlNodeSetSpacePreserve">xmlNodeSetSpacePreserve</a><br />
 <a href="html/libxml-parser.html#xmlParserInputGrow">xmlParserInputGrow</a><br />
 <a href="html/libxml-parser.html#xmlParserInputRead">xmlParserInputRead</a><br />
+<a href="html/libxml-xmlreader.html#xmlTextReaderPreserve">xmlTextReaderPreserve</a><br />
 <a href="html/libxml-xmlreader.html#xmlTextReaderPreservePattern">xmlTextReaderPreservePattern</a><br />
 </dd><dt>preserved</dt><dd><a href="html/libxml-HTMLtree.html#HTML_PRESERVE_NODE">HTML_PRESERVE_NODE</a><br />
 <a href="html/libxml-tree.html#xmlNewTextChild">xmlNewTextChild</a><br />