plstransform: Set a global coordinate transform function

`plstransform`: Set a global coordinate transform function
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`plstransform`: Set a global coordinate transform function

`plstransform (`	`coordinate_transform` ,
	`coordinate_transform_data` `)`;

This function can be used to define a coordinate transformation which affects all elements drawn within the current plot window. The coordinate_transform callback function is similar to that provided for the plmap and plmeridians functions. The coordinate_transform_data parameter may be used to pass extra data to coordinate_transform.

coordinate_transform (PLTRANSFORM_callback, input): A callback function that defines the transformation from the input (x, y) world coordinates to new PLplot world coordinates. If coordinate_transform is not supplied (e.g., is set to NULL in the C case), then no transform is applied.
coordinate_transform_data (PLPointer, input): Optional extra data for coordinate_transform.

Redacted form:

General: plstransform(coordinate_transform, coordinate_transform_data)

This function is used in examples 19 and 22.

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