[GRASS5] Updated vector layer text

[Trevor Wiens]

I've grabbed the vector data processing page as suggested by Helena and
have made a few additions to try to provide some clarity on the issue
of topology and layers. Hopefully this will be a little clearer for
naive users than it was before.

I've attached the file to this e-mail and look forward to hearing your comments. 

Thanks

T
-- 
Trevor Wiens 
twiens at interbaun.com

The significant problems that we face cannot be solved at the same 
level of thinking we were at when we created them. 
(Albert Einstein)
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