Fix for checking out inside of repository with nfs and automount

[Donald Sharp]

There are certain situations where cvs will allow the user
to checkout a module inside of the repository when a nfs server
and auto mounting is done.  Here's a small patch that will 
fix this issue.

This patch modifies the current behaviour of checkout.c, safe_location()
to assume that you are not inside of the repository if you are using cvs
in a remote manner.

I did not include a change to sanity.sh as that it would need root
access, a nfs server and access to a automounting system on your
test machine.

The patch is included as a attachment.

Thanks!

donald

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