[GRASS5] NVIZ with volume + g.list -> rast3d

[Helena]

> 
> PS: I have added 3D raster listing to g.list:
> GRASS 5.7.cvs:~/grassdata > g.list rast3d

Markus,

there is also g3.list for listing the 3d files (as well
as few other g3.* commands http://grass.itc.it/gdp/html_grass5/grid3d.html)
It looks like adding 3d option to the existing g.* commands is a better
approach than having separate g3.* commands (I find it more intuitive).
It is just a few commands (copy, rename, remove, region and projinfo/setproj)
and we can retire the g3.* scripts.

Helena
> ----------------------------------------------
> raster3D files available in mapset jaro:
> zrazky2.g3d
> 
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