[GRASS5] Layered XDRIVER2 uploaded into /todo section

Hi again,

to avoid that the code gets lost: I have uploaded the
layered XDRIVER2 into a new /todo section in CVS

(cvs up -dP)

This directory contains

- a new layered XDRIVER2 (fifo)
- a new R_driver2()
- display modules updated to have a new r:g:b color parameter
- d.layers to allow layer management in GRASS Monitor
- the communication between Markus and Pierre on this issue
The diffs are against GRASS 5beta7
Everything written by Pierre de Mouveaux <pmx@audiovu.com>
(unfortunately currently offline from GRASS development)

Pierre's idea was to implement a XDRIVER supporting maps as
layers (to individually switch them on and off within a GUI).
The d.layers module demonstrates how it works (it does!).

Additionally a new display parameter to control display colors
by r:g:b values have been implemented.
Find it all in todo/

Regards

Markus

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