Completely changed the way the XPath evaluation is done, likely to break

stuff like libxslt right now:
- Makefile.am: detect XPath memleaks in regreson tests
- error.c: fixed and error w.r.t. error reporting still using
  stderr
- hash.c: added new line at end of file
- tree.h: minor cleanup
- xpath.[ch] xpointer.[ch]: Major changes ! Separated XPath
  expression parsing from evaluation, resulted in a number of
  changes internally, and in XPointer. Likely to break stuff
  using xpathInternals.h but should remain binary compatible,
  new interfaces will be added.
Daniel

include/libxml/xpointer.h

@@ -34,9 +34,15 @@ struct _xmlLocationSet {
  * Handling of location sets
  */
 
+xmlLocationSetPtr	xmlXPtrLocationSetCreate(xmlXPathObjectPtr val);
 void			xmlXPtrFreeLocationSet	(xmlLocationSetPtr obj);
 xmlLocationSetPtr	xmlXPtrLocationSetMerge	(xmlLocationSetPtr val1,
 						 xmlLocationSetPtr val2);
+xmlXPathObjectPtr	xmlXPtrNewRangeNodeObject(xmlNodePtr start,
+						 xmlXPathObjectPtr end);
+void			xmlXPtrLocationSetAdd	(xmlLocationSetPtr cur,
+						 xmlXPathObjectPtr val);
+xmlXPathObjectPtr	xmlXPtrWrapLocationSet	(xmlLocationSetPtr val);
 
 /*
  * Functions