revamped the elfgcchack.h format to cope with gcc4 change of aliasing

* doc/apibuild.py doc/elfgcchack.xsl: revamped the elfgcchack.h
  format to cope with gcc4 change of aliasing allowed scopes, had
  to add extra informations to doc/libxml2-api.xml to separate
  the header from the c module source.
* *.c: updated all c library files to add a #define bottom_xxx
  and reimport elfgcchack.h thereafter, and a bit of cleanups.
* doc//* testapi.c: regenerated when rebuilding the API
Daniel
diff --git a/doc/APIchunk23.html b/doc/APIchunk23.html
index ab4b35c..5a6b311 100644
--- a/doc/APIchunk23.html
+++ b/doc/APIchunk23.html
@@ -58,6 +58,7 @@
 <a href="html/libxml-HTMLparser.html#htmlIsAutoClosed">htmlIsAutoClosed</a><br />
 <a href="html/libxml-HTMLtree.html#htmlSetMetaEncoding">htmlSetMetaEncoding</a><br />
 </dd><dt>take</dt><dd><a href="html/libxml-threads.html#xmlLockLibrary">xmlLockLibrary</a><br />
+</dd><dt>takes</dt><dd><a href="html/libxml-xmlschemastypes.html#xmlSchemaValidateFacetWhtsp">xmlSchemaValidateFacetWhtsp</a><br />
 </dd><dt>tell</dt><dd><a href="html/libxml-parser.html#XML_COMPLETE_ATTRS">XML_COMPLETE_ATTRS</a><br />
 <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 />
@@ -418,7 +419,9 @@
 <a href="html/libxml-parser.html#xmlExternalEntityLoader">xmlExternalEntityLoader</a><br />
 <a href="html/libxml-parserInternals.html#xmlParseSDDecl">xmlParseSDDecl</a><br />
 <a href="html/libxml-xmlschemastypes.html#xmlSchemaCheckFacet">xmlSchemaCheckFacet</a><br />
+<a href="html/libxml-xmlschemastypes.html#xmlSchemaGetCanonValue">xmlSchemaGetCanonValue</a><br />
 <a href="html/libxml-xmlschemastypes.html#xmlSchemaNewStringValue">xmlSchemaNewStringValue</a><br />
+<a href="html/libxml-xmlschemastypes.html#xmlSchemaValidateFacetWhtsp">xmlSchemaValidateFacetWhtsp</a><br />
 </dd><dt>typo</dt><dd><a href="html/libxml-parserInternals.html#xmlParseTextDecl">xmlParseTextDecl</a><br />
 </dd></dl><h2 align="center"><a href="APIchunk0.html">A-B</a>
 <a href="APIchunk1.html">C-C</a>