[Gnu-arch-users] Error handling updates

[Aaron Bentley]

[meant to post to list, but just posted to Tom]
Here's a patch that adds functions that can ensure a revision exists in
the archive.  It adapts tla get to issue the error "No such revision"
when the user enters a valid, but non-existant revision name.

The second patch does the same for tla get-changeset.

I've added the arch_check_for_revision() convenience function to
cmdutils.[ch], based on suggestions Tom made to jblack

This is my first submission, so suggestions/critiques are quite welcome.

Aaron

-- 
Aaron Bentley
Director of Technology
PanoMetrics, Inc.

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