changed 'make tests' to use a concise output, scrolling to see where thing

* Makefile.am: changed 'make tests' to use a concise output,
  scrolling to see where thing broke wasn't pleasant
* configure.in: some beta4 preparation, but not ready yet
* error.c globals.c include/libxml/globals.h include/libxml/xmlerror.h:
  new error handling code, last error informations are stored
  in the parsing context or a global variable, new APIs to
  handle the xmlErrorPtr type.
* parser.c parserInternals.c valid.c : started migrating to the
  new error handling code, it's a royal pain.
* include/libxml/parser.h include/libxml/parserInternals.h:
  moved the definition of xmlNewParserCtxt()
* parser.c: small potential buffer access problem in push code
  provided by Justin Fletcher
* result/*.sax result/VC/PENesting* result/namespaces/*
  result/valid/*.err: some error messages were sligthly changed.
Daniel
diff --git a/parserInternals.c b/parserInternals.c
index 7b2270c..8966d8a 100644
--- a/parserInternals.c
+++ b/parserInternals.c
@@ -2123,6 +2123,19 @@
 	    cur = next;
 	}
     }
+    /*
+     * cleanup the error strings
+     */
+    if (ctxt->lastError.message != NULL)
+        xmlFree(ctxt->lastError.message);
+    if (ctxt->lastError.file != NULL)
+        xmlFree(ctxt->lastError.file);
+    if (ctxt->lastError.str1 != NULL)
+        xmlFree(ctxt->lastError.str1);
+    if (ctxt->lastError.str2 != NULL)
+        xmlFree(ctxt->lastError.str2);
+    if (ctxt->lastError.str3 != NULL)
+        xmlFree(ctxt->lastError.str3);
 
 #ifdef LIBXML_CATALOG_ENABLED
     if (ctxt->catalogs != NULL)