plgdiori: Get plot orientation

`plgdiori`: Get plot orientation
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#### `plgdiori`: Get plot orientation

`plgdiori (` | p_rot`)`;

Get plot orientation parameter which is multiplied by 90° to obtain the angle of rotation. Note, arbitrary rotation parameters such as 0.2 (corresponding to 18°) are possible, but the usual values for the rotation parameter are 0., 1., 2., and 3. corresponding to 0° (landscape mode), 90° (portrait mode), 180° (seascape mode), and 270° (upside-down mode). If `plsdiori` has not been called the default value pointed to by ``p_rot`` will be 0.

`p_rot` (``PLFLT_NC_SCALAR``, output)

  Returned value of the orientation parameter.

Redacted form: `plgdiori(p_rot)`

This function is not used in any examples.

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