Add sys.excepthook. Update docstring and library reference section on 'sys' module. New API PyErr_Display, just for displaying errors, called by excepthook. Uncaught exceptions now call sys.excepthook; if that fails, we fall back to calling PyErr_Display directly. Also comes with sys.__excepthook__ and sys.__displayhook__.

--- a/Include/pythonrun.h	Fri Mar 23 00:12:53 2001 +0000
+++ b/Include/pythonrun.h	Fri Mar 23 02:46:52 2001 +0000
@@ -59,6 +59,7 @@
 
 DL_IMPORT(void) PyErr_Print(void);
 DL_IMPORT(void) PyErr_PrintEx(int);
+DL_IMPORT(void) PyErr_Display(PyObject *, PyObject *, PyObject *);
 
 DL_IMPORT(int) Py_AtExit(void (*func)(void));