fix test_py3kwarns
The fact that this was failing and went unnoticed so long seems like a good argument for being able to enable and disble py3kwarnings through Python.
diff --git a/Lib/mimetools.py b/Lib/mimetools.py
index 5dd5396..02963b5 100644
--- a/Lib/mimetools.py
+++ b/Lib/mimetools.py
@@ -6,7 +6,8 @@
import tempfile
from warnings import warnpy3k
-warnpy3k("in 3.x, mimetools has been removed in favor of the email package")
+warnpy3k("in 3.x, mimetools has been removed in favor of the email package",
+ stacklevel=2)
__all__ = ["Message","choose_boundary","encode","decode","copyliteral",
"copybinary"]