[GRASS5] [bug #4063] (grass) r.colors be able to make grey.eq and gray.log on float raster

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this bug's URL: http://intevation.de/rt/webrt?serial_num=4063
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Subject: r.colors be able to make grey.eq and gray.log on float raster

Platform: GNU/Linux/x86
grass obtained from: Mirror of Trento site
grass binary for platform: Compiled from Sources
GRASS Version: cvs_2006_02_04

I really like to see r.colors be able to make grey.eq and grey.log colorscales with float rasters. When one wants to make a figure for a paper, it will be in greyscale (most times) and the 'simple' greyscale from r.colors usually is not as good as it could be.

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