plglevel: Get the (current) run level

`plglevel`: Get the (current) run level
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#### `plglevel`: Get the (current) run level

`plglevel (` | p_level`)`;

Get the (current) run level. Valid settings are:

- 0, uninitialized

- 1, initialized

- 2, viewport defined

- 3, world coordinates defined

`p_level` (`PLINT *`, output)

  Pointer to the run level.

Redacted form: `plglevel(p_level)`

This function is used in example 31.

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