pl_setcontlabelparam: Set parameters of contour labelling other than format of numerical label

`pl_setcontlabelparam`: Set parameters of contour labelling other than format of numerical label
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`pl_setcontlabelparam`: Set parameters of contour labelling other than format of numerical label

`pl_setcontlabelparam (`	`offset`,
	`size`,
	`spacing`,
	`active)`;

Set parameters of contour labelling other than those handled by pl_setcontlabelformat.

offset (PLFLT, input): Offset of label from contour line (if set to 0.0, labels are printed on the lines). Default value is 0.006.
size (PLFLT, input): Font height for contour labels (normalized). Default value is 0.3.
spacing (PLFLT, input): Spacing parameter for contour labels. Default value is 0.1.
active (PLINT, input): Activate labels. Set to 1 if you want contour labels on. Default is off (0).

Redacted form: pl_setcontlabelparam(offset, size, spacing, active)

This function is used in example 9.

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