Fixed memory leak reported by Dave Beckett Removed spurious comment

* parser.c, xmlmemory.c, include/libxml/xmlmemory.h: Fixed
  memory leak reported by Dave Beckett
* xmlschemas.c: Removed spurious comment reported on the mailing
  list
* xinclude.c, xpath.c, xpointer.c, libxml/include/xpointer.h:
  Further work on Bug 129967 concerning xpointer range handling
  and range-to function; much better, but still not complete

parser.c

@@ -12112,6 +12112,7 @@ xmlCleanupParser(void) {
     xmlCleanupGlobals();
     xmlResetLastError();
     xmlCleanupThreads(); /* must be last if called not from the main thread */
+    xmlCleanupMemory();
     xmlParserInitialized = 0;
 }