paalied patch from Julio M. Merino Vidal fixing bug #134751 to fix

* configure.in doc/Makefile.am include/libxml/Makefile.am:
  paalied patch from Julio M. Merino Vidal fixing bug #134751
  to fix --with-html-dir option.
* doc/*: rebuilt fully the docs
* doc/html/libxml-xmlsave.html: new file from new header.
Daniel
diff --git a/doc/APIchunk24.html b/doc/APIchunk24.html
index ac217c7..d418a4f 100644
--- a/doc/APIchunk24.html
+++ b/doc/APIchunk24.html
@@ -413,6 +413,7 @@
 <a href="html/libxml-encoding.html#xmlNewCharEncodingHandler">xmlNewCharEncodingHandler</a><br />
 <a href="html/libxml-xmlIO.html#xmlOutputBufferCreateIO">xmlOutputBufferCreateIO</a><br />
 <a href="html/libxml-xmlIO.html#xmlOutputWriteCallback">xmlOutputWriteCallback</a><br />
+<a href="html/libxml-xmlsave.html#xmlSaveToIO">xmlSaveToIO</a><br />
 <a href="html/libxml-debugXML.html#xmlShellWrite">xmlShellWrite</a><br />
 </dd><dt>writer</dt><dd><a href="html/libxml-xmlwriter.html#xmlFreeTextWriter">xmlFreeTextWriter</a><br />
 </dd><dt>writes</dt><dd><a href="html/libxml-tree.html#xmlBufferWriteQuotedString">xmlBufferWriteQuotedString</a><br />