IF a user has matplotlib installed outside of Sage
AND they have a matplotlibrc file in ~/.matplotlib

THEN Sage will use the non-Sage version in ~/.matplotlib/matplotlibrc.
 If a user has set a frontend (such as WxAgg or any other GUI
frontend) that Sage doesn't have (most of them), matplotlib won't run
in the notebook.

A simple fix is posted here.  The basic idea is that Sage should ship
its own matplotlibrc files, install it in .sage/matplotlib and set the
MPLCONFIGDIR variable to point to .sage/matplotlib



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