Use NewLayerInfo() to allocate and initialize a Layer_Info structure and
associated sub-structures.

    struct Layer_Info *NewLayerInfo( void );

You must call this function before attempting to use any of the other
layers functions described below.  When you have finished with a
Layer_Info structure, use DisposeLayerInfo() to deallocate it.

    void DisposeLayerInfo( struct Layer_Info *li );

This function deallocates a Layer_Info and associated structures
previously allocated with NewLayerInfo().

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