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tcl function: source $script -- run current tcl script
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keyboard equivalent: none

The "GO" button on the "tcl:" entry line runs the
tcl script specified in the entry in the context
of the data currently displayed on the surface.

The script can modify any tksurfer tcl variable
and call any tksurfer tcl function.  To see a
list of variables and functions, use tksurfer -h

After executing a set of tcl commands, use
"redrawbutton" to see the effects, or "restore"
to go back to a sane view (equivalent to REDRAW
and RESTORE interface buttons).

The script will be automatically wrapped with
"catch" and any errors returned in a pop-up.
