[GRASS5] [bug #3657] (grass) overwrite option for commands in tcltk

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this bug's URL: http://intevation.de/rt/webrt?serial_num=3657
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Subject: overwrite option for commands in tcltk

Platform: GNU/Linux/i386
grass obtained from: Mirror of Trento site
grass binary for platform: Compiled from Sources
GRASS Version: 6.1cvs downloaded at 20050919

Carlos Grohmann. GRASS 6.1 cvs downloaded at 2005/09/19

I think that _all_ commands that create new maps should have an "overwrite" option available in the tcltk window. It would make life easier. I know that there is the possibility to change this behaviour with grass environment variables, but that is something a newbie user wouldn't do. 

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