changed xmlPatterncompile signature to pass an int and not an enum since

* pattern.c include/libxml/pattern.h: changed xmlPatterncompile
  signature to pass an int and not an enum since it can generate
  ABI compat troubles.
* include/libxml/schematron.h schematron.c: adding the new
  schematron code, work in progress lots to be left and needing
  testing
* include/libxml/xmlversion.h.in include/libxml/xmlwin32version.h.in
  Makefile.am configure.in: integration of schematron into the
  build
* xpath.c include/libxml/xpath.h: adding flags to control compilation
  options right now just XML_XPATH_CHECKNS.
Daniel

include/libxml/xpath.h

@@ -248,6 +248,14 @@ typedef xmlXPathFunction (*xmlXPathFuncLookupFunc) (void *ctxt,
 					 const xmlChar *name,
 					 const xmlChar *ns_uri);
 
+/**
+ * xmlXPathFlags:
+ * Flags for XPath engine compilation and runtime
+ */
+typedef enum {
+    XML_XPATH_CHECKNS = 1		/* check namespaces at compilation */
+} xmlXPathFlags;
+
 /**
  * xmlXPathContext:
  *
@@ -324,6 +332,8 @@ struct _xmlXPathContext {
 
     /* dictionnary */
     xmlDictPtr dict;			/* dictionnary if any */
+
+    int flags;				/* flags to control compilation */
 };
 
 /*