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

include/libxml/parser.h

@@ -15,6 +15,7 @@
 #include <libxml/hash.h>
 #include <libxml/valid.h>
 #include <libxml/entities.h>
+#include <libxml/xmlerror.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -272,6 +273,11 @@ struct _xmlParserCtxt {
     xmlNodePtr        freeElems;    /* List of freed element nodes */
     int               freeAttrsNr;  /* number of freed attributes nodes */
     xmlAttrPtr        freeAttrs;    /* List of freed attributes nodes */
+
+    /*
+     * the complete error informations for the last error.
+     */
+    xmlError          lastError;
 };
 
 /**
@@ -977,6 +983,8 @@ XMLPUBFUN int XMLCALL
 /*
  * Parser contexts handling.
  */
+XMLPUBFUN xmlParserCtxtPtr XMLCALL	
+		xmlNewParserCtxt	(void);
 XMLPUBFUN int XMLCALL		
 		xmlInitParserCtxt	(xmlParserCtxtPtr ctxt);
 XMLPUBFUN void XMLCALL