- configure.in: releasing 2.2.4

- parser.[ch]: added xmlStrEqual()
- HTMLparser.c HTMLtree.c SAX.c debugXML.c entities.c parser.c
  tree.c valid.c xlink.c xpath.c: converted all !xmlStrcmp to
  use xmlStrEqual instead
- TODO: updated
- added an XPath test
Daniel

include/libxml/parser.h

@@ -348,6 +348,8 @@ int		xmlStrcasecmp		(const xmlChar *str1,
 int		xmlStrncasecmp		(const xmlChar *str1,
 					 const xmlChar *str2,
 					 int len);
+int		xmlStrEqual		(const xmlChar *str1,
+					 const xmlChar *str2);
 int		xmlStrlen		(const xmlChar *str);
 xmlChar *	xmlStrcat		(xmlChar *cur,
 					 const xmlChar *add);