#99 Hang on RPy exit when x11() graphics device is open

[Gregory Warnes]

RPy hangs on exit when x11() graphics device is open with R 2.5.x and 2.6.x.

This simple code:

from rpy import r
r.plot(range(100))
^D

hangs R on Mac OSX 10.4.8.

Explicitly closing the graphics device before exiting python solves the problem.