preparing release of 2.6.18 updated docs and rebuilt reactivated gcc

* NEWS configure.in testapi.c doc/*: preparing release of 2.6.18
  updated docs and rebuilt
* libxml.spec.in: reactivated gcc profiling for gcc >= 4.0.0
Daniel
diff --git a/doc/APIsymbols.html b/doc/APIsymbols.html
index f688e10..7dbc146 100644
--- a/doc/APIsymbols.html
+++ b/doc/APIsymbols.html
@@ -2525,6 +2525,7 @@
 <a href="html/libxml-xmlschemastypes.html#xmlSchemaCompareValues">xmlSchemaCompareValues</a><br />
 <a href="html/libxml-xmlschemastypes.html#xmlSchemaCompareValuesWhtsp">xmlSchemaCompareValuesWhtsp</a><br />
 <a href="html/libxml-schemasInternals.html#xmlSchemaContentType">xmlSchemaContentType</a><br />
+<a href="html/libxml-xmlschemastypes.html#xmlSchemaCopyValue">xmlSchemaCopyValue</a><br />
 <a href="html/libxml-xmlschemas.html#xmlSchemaDump">xmlSchemaDump</a><br />
 <a href="html/libxml-schemasInternals.html#xmlSchemaElement">xmlSchemaElement</a><br />
 <a href="html/libxml-schemasInternals.html#xmlSchemaElementPtr">xmlSchemaElementPtr</a><br />