pl_setcontlabelformat: Set format of numerical label for contours

`pl_setcontlabelformat`: Set format of numerical label for contours
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`pl_setcontlabelformat (`	`lexp`,
	`sigdig)`;

Set format of numerical label for contours.

lexp (PLINT, input): If the contour numerical label is greater than 10^(lexp) or less than 10^(-lexp), then the exponential format is used. Default value of lexp is 4.
sigdig (PLINT, input): Number of significant digits. Default value is 2.

Redacted form: pl_setcontlabelformat(lexp, sigdig)

This function is used example 9.