[GRASS5] Raster directory structure, comments

[Hamish]

> I realize 32000 is not a significant limit for most uses of grass
> today. As we work with more 3D, volume, animation and modeling it will
> probably become more of an issue.


Between g.mapset's ability to change mapset midstream, g.mapsets and
map at other_mapset working with every module, is there really any reason
not to break your work up into multiple mapsets by the time you get to
32k maps? Personally, as far as problems on the horizon go I'm much more
worried about getting 64bitness right.


Hamish