Updating the developer install: setup-cvs.py

Hi all,

I updated the developer installation script setup-cvs.py to support not only linux, but also windows.
Currently setup-cvs.py creates a bash script for copying files and creating links. 

File system links are not supported by windows, so I made the following changes:

   - Use __path__ statement to link modules instead of using file system links
   - Copy images and other data files instead of linking them.

Additional I execute commands directly instead of writing them to a script.

I have the following questions:
   a) Is there a better way to startup gnue in windows than using batch files? (f.e. gfcvs.bat)
   b) Should the gnue script directory be added to the default path? 
   c) Although it is a developer install: How about creating registry settings for .gfd etc. files.

Finally I propose to change the name setup-cvs.py to setup-devel.py.

Any feedback on this idea is welcome.

Thanks,
Jan