added the xmlWriter module contributed by Alfred Mickautsch added room for

* configure.in xmlwriter.c Makefile.am include/libxml/xmlwriter.h
  include/libxml/Makefile.am include/libxml/xmlversion.h.in:
  added the xmlWriter module contributed by Alfred Mickautsch
* include/libxml/tree.h: added room for line and extra information
* xmlreader.c python/tests/reader6.py: bugfixing some problem some
  of them introduced in September
* win32/libxml2.def.src doc/libxml2-api.xml: regenerated the API
Daniel
diff --git a/configure.in b/configure.in
index f53ebf6..e5e7237 100644
--- a/configure.in
+++ b/configure.in
@@ -622,6 +622,23 @@
 AC_SUBST(WITH_READER)
 AC_SUBST(READER_TEST)
 
+AC_ARG_WITH(writer,
+[  --with-writer           add the xmlWriter saving interface (on)])
+if test "$with_minimum" = "yes" -a "$with_writer" = ""
+then
+    with_writer=no
+fi
+if test "$with_writer" = "no" ; then
+    echo Disabling the xmlWriter saving interface
+    WITH_WRITER=0
+#    WRITER_TEST=
+else    
+    WITH_WRITER=1
+#    WRITER_TEST=Writertests
+fi
+AC_SUBST(WITH_WRITER)
+#AC_SUBST(WRITER_TEST)
+
 AC_ARG_WITH(sax1,
 [  --with-sax1             add the older SAX1 interface (on)])
 if test "$with_minimum" = "yes" -a "$with_sax1" = ""