[GRASS5] [bug #824] (grass) d.3d tcltkgrass interface : wrong zero elevation option

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this bug's URL: http://intevation.de/rt/webrt?serial_num=824
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Subject: d.3d tcltkgrass interface : wrong zero elevation option

Platform: Solaris7/Intel
Xwindows version: Barco X11R6
Xwindows manager: CDE
TclTk version: tcl/tk 8.2
grass downloaded at: Baylor site
grass binary for platform: I compiled the sources myself
grass sources source: no, I got a source code package from the server, grass5.0.0pre2
c compiler name: gcc

When displaying 3d raster (d.3d)
using tcltk interface
selecting 'show zero elevations' option 
adds -0 to the command line instead of -n, resulting in error message

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