Release of libxnl2-2.9.7

* configure.ac doc/news.html : update for release
* doc/news.html doc/xmlcatalog.1 doc/xmlcatalog_man.html: regenerated
diff --git a/configure.ac b/configure.ac
index c0c90d7..8dbc56c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,7 +9,7 @@
 
 LIBXML_MAJOR_VERSION=2
 LIBXML_MINOR_VERSION=9
-LIBXML_MICRO_VERSION=6
+LIBXML_MICRO_VERSION=7
 LIBXML_MICRO_VERSION_SUFFIX=
 LIBXML_VERSION=$LIBXML_MAJOR_VERSION.$LIBXML_MINOR_VERSION.$LIBXML_MICRO_VERSION$LIBXML_MICRO_VERSION_SUFFIX
 LIBXML_VERSION_INFO=`expr $LIBXML_MAJOR_VERSION + $LIBXML_MINOR_VERSION`:$LIBXML_MICRO_VERSION:$LIBXML_MINOR_VERSION