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/APIfunctions.html b/doc/APIfunctions.html
index 3a5bad6..c96a8d0 100644
--- a/doc/APIfunctions.html
+++ b/doc/APIfunctions.html
@@ -1813,6 +1813,7 @@
 <a href="html/libxml-xmlschemastypes.html#xmlSchemaValidatePredefinedType">xmlSchemaValidatePredefinedType</a><br />
 </p><h2>Type xmlSchemaValPtr:</h2><p><a href="html/libxml-xmlschemastypes.html#xmlSchemaCompareValues">xmlSchemaCompareValues</a><br />
 <a href="html/libxml-xmlschemastypes.html#xmlSchemaCompareValuesWhtsp">xmlSchemaCompareValuesWhtsp</a><br />
+<a href="html/libxml-xmlschemastypes.html#xmlSchemaCopyValue">xmlSchemaCopyValue</a><br />
 <a href="html/libxml-xmlschemastypes.html#xmlSchemaFreeValue">xmlSchemaFreeValue</a><br />
 <a href="html/libxml-xmlschemastypes.html#xmlSchemaGetCanonValue">xmlSchemaGetCanonValue</a><br />
 <a href="html/libxml-xmlschemastypes.html#xmlSchemaValidateFacet">xmlSchemaValidateFacet</a><br />