Windows DMD installer

[Ary Borenszweig]

Ary Borenszweig wrote:
> Walter Bright wrote:
>> For the initial version, I'd be happy if it downloaded the zip file, 
>> unzipped it, and set the path.
> 
> Here:
> 
> http://downloads.dsource.org/projects/descent/dinstaller/
> 
> (I just put it there because I didn't know where else)
> 
> Maybe this can be used as the initial source code for the project...

Meh, dmd doesn't seem to work if the path has spaces. Also I forgot to 
download dmc.zip.

Now the installer should work ok (it suggests "C:\D" as the default 
installation dir).