plSetUsage: Set the ascii character strings used in usage and syntax messages

`plSetUsage`: Set the ascii character strings used in usage and syntax messages
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#### `plSetUsage`: Set the ascii character strings used in usage and syntax messages

`plSetUsage (` | program_string,
| usage_string`)`;

Sets the program string and usage string displayed by the command line help option (-h) and by `plOptUsage`.

`program_string` (``PLCHAR_VECTOR``, input)

  An ascii character string to appear as the name of program.

`usage_string` (``PLCHAR_VECTOR``, input)

  An ascii character string to appear as the usage text.

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

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