Keywords: greg-2011

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### Removed

The following `GTV` variables are removed:

- `GTV%SLEEP`: the real-time or delayed drawing status, but this functionality is removed.
- `GTV%IMAGES[2,15]`: size and memory address of the images stored in the metacode, for debugging purpose.
- `GTV%IDENT`: the number in Terminal Definition File of the device currently in use.
- the `LUT` array is removed: it was describing the hue values of the current Look-Up Table in use. But since the hue is not enough to describe a LUT (saturation and value are also needed), the two triplets (`LUT%RED`, `LUT%GREEN`, `LUT%BLUE`) or (`LUT%HUE`, `LUT%SATURATION`, `LUT%VALUE`) should now be used to get and set the Look-Up Table values.
- `REXTR`: the extrema (in plot_page units) of the last segment created in the metacode.
- `REXTR_D`: the extrema (in plot_page units) of the current working directory.