Added all changes from old 4.0 version:

PSTACK, libmysqld and MySQL filesystem
UPDATE ... ORDER BY
DELETE ... ORDER BY
New faster fulltext handling
Faster compressed keys

pstack/pstack.h

@@ -0,0 +1,22 @@
+/* $Header$ */
+
+#ifndef	pstack_pstack_h_
+#define	pstack_pstack_h_
+
+#include	"pstacktrace.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Install the stack-trace-on-SEGV handler....
+ */
+extern int
+pstack_install_segv_action(	const char*	path_format);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* pstack_pstack_h_ */
+