plOptUsage: Print usage and syntax message

`plOptUsage`: Print usage and syntax message
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`plOptUsage`: Print usage and syntax message

plOptUsage ( );

Prints the usage and syntax message. The message can also be displayed using the -h command line option. There is a default message describing the default PLplot options. The usage message is also modified by plSetUsage and plMergeOpts.

This function is not used in any of our C examples.

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`plMinMax2dGrid`: Find the minimum and maximum of a PLFLT matrix of type PLFLT_MATRIX allocated using `plAlloc2dGrid`	Home	`plResetOpts`: Reset internal option table info structure