Contour level color

Syntax: | `CONTOUR\COLORS colr { x y } v nctr { min { incr }} CONTOUR\INTERP/COLORS colr ntrp { x y } v num { min { incr }} CONTOUR\SPECIFIC\COLORS colr { x y } v lvls CONTOUR\SPECIFIC\INTERP/COLORS colr ntrp { x y } v lvls`

Contours in color can be obtained using the `\COLOR` qualifier. A color vector, `colr`, is expected as the first parameter. The length of `colr` should be the same as the number of contours requested. A positive numeric value represents the index of the color in the currently loaded colormap. A negative number represents the index of the fixed color.

Contour level selection
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