comments cleanups use xmllint for doing the RelaxNG tests preparing 2.5.2

* HTMLparser.c tree.c xmlIO.c: comments cleanups
* Makefile.am: use xmllint for doing the RelaxNG tests
* configure.in: preparing 2.5.2 made schemas support default to
  on instead of off
* relaxng.c: removed the verbosity
* xmllint.c: added --relaxng option
* python/generator.py python/libxml_wrap.h: prepared the integration
  of the new RelaxNG module and schemas
* result/relaxng/*: less verbose output
Daniel
diff --git a/configure.in b/configure.in
index ad6f08f..363401a 100644
--- a/configure.in
+++ b/configure.in
@@ -6,7 +6,7 @@
 
 LIBXML_MAJOR_VERSION=2
 LIBXML_MINOR_VERSION=5
-LIBXML_MICRO_VERSION=1
+LIBXML_MICRO_VERSION=2
 LIBXML_VERSION=$LIBXML_MAJOR_VERSION.$LIBXML_MINOR_VERSION.$LIBXML_MICRO_VERSION
 LIBXML_VERSION_INFO=`expr $LIBXML_MAJOR_VERSION + $LIBXML_MINOR_VERSION`:$LIBXML_MICRO_VERSION:$LIBXML_MINOR_VERSION
 
@@ -579,9 +579,9 @@
 XML_LIBS="-lxml2 $Z_LIBS $THREAD_LIBS $ICONV_LIBS $M_LIBS $LIBS"
 AC_SUBST(WITH_ICONV)
 
-AC_ARG_WITH(schemas, [  --with-schemas              Add experimental Schemas support (off)])
+AC_ARG_WITH(schemas, [  --with-schemas              Add experimental Schemas/RelaxNG support (on)])
 if test "$with_schemas" = "yes" ; then
-    echo "Enabling Schemas/Relax-NG support"
+    echo "Enabled Schemas/Relax-NG support"
     WITH_SCHEMAS=1
     TEST_SCHEMAS="Schemastests Relaxtests"
     with_regexps=yes