Added updating to remove file selection window to go away. After upgrading many python packages, the performance of ARTview was dramatically affected.  Less responsive windows and a file selction window that would not go away.
Added updating to remove file selection window to go away.
After upgrading many python packages, the performance of
ARTview was dramatically affected.  Less responsive
windows and a file selction window that would not go away.

nguy/artview,gamaanderson/artview,jjhelmus/artview