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tcl function: editfile $val2rgblut
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keyboard equivalent: none

The "ED" button on the "lut:" (color look up
table) entry line edits the lut file named in the
entry to the left using a basic editor (tries
TextEdit, gedit, nedit, xedit in that order).

If the file in the "lut:" field (by default,
*/$scandir/val2rgb.lut) doesn't exist when the
"ED" button is clicked, a default one will be
contructed when the editor opens.

To cause the editor to be vi inside a popped-up
gterm or xterm, set this environment variable:

  setenv CSURFEDITORVIGTERM
         *or*
  export CSURFEDITORVIGTERM=1
