New PGPLOT device (May 21, 2012)
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A new PGPLOT device for plotting in a screen window has been made
available. It is named SCREEN and it can be used as an alternative to
the existing device X11, which has the big disadvantage that it doesn't
properly handle expose events. This has the consequence that X11 loses
its window contents when it has been covered by other windows.

For the implementation of SCREEN the task PGVIEW is used. This task is
started automatically when it is not already active but it can also be
started by the user. The latter can be useful when a different window
size needs to be specified with PGVIEW's keyword XYZIZE=. This keyword
can also be specified in a default file for PGVIEW, e.g,
$HOME/.gipsy/pgview.def.