updated for version 7.3.1287

Problem:    Python SystemExit exception is not handled properly.
Solution:   Catch the exception and give an error. (Yasuhiro Matsumoto, Ken
            Takata)

runtime/doc/if_pyth.txt

@@ -740,6 +740,11 @@ To work around such problems there are these options:
 3. You undefine PY_NO_RTLD_GLOBAL in auto/config.h after configuration.  This
    may crash Vim though.
 
+							*E880*
+Raising SystemExit exception in python isn't endorsed way to quit vim, use: >
+	:py vim.command("qall!")
+<
+
 							*has-python*
 You can test what Python version is available with: >
 	if has('python')