Saving contour levels and coordinates

The contour levels are automatically stored in a vector named `CCONT`. If the `\COORDINATES` qualifier is used, the x and y coordinates of each contour level are stored in matrices named `XCNT` and `YCNT`. The number of points stored for each level is the first element of each column. For example, `XCNT[1,nc] (=n1)` is the number of points making up contour number `nc`, while `XCNT[2:n1+1,nc]` and `YCNT[2:n1+1,nc]` would contain the x and y coordinates of the `nc`th contour level. These vectors are then available to the user for plotting and/or manipulation. Each time the `CONTOUR` command is entered, these vectors are emptied and replaced, so if you wish to keep them, they should be renamed or copied into other vectors.

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