misc/mnemosyne needs graphics/py-imaging

[Dennis den Brok <d.den.brok%uni-bonn.de@localhost>]

Hello,

I don't know by what change this was triggered, but it seems that
now regardless of the prefered python version, misc/mnemosyne needs
graphics/py-imaging as a run dependency, otherwise it won't run.
It would be nice if anyone could update mnemosyne's Makefile
accordingly.

BTW, if building py-imaging directly (using pbulk, if that matters),
all python versions are built, as well as py2{4,5,6}-imaging. Is
there a way to get one particular version only? (I have
PYTHON_VERSION_DEFAULT set to 25.)

TIA,

Dennis den Brok