[rdiff-backup-users] PATCH: Exclude if present

[Jeff Strunk]

I have a small contribution to make in the form of a simple selection 
function.

My company has found that we needed a way for users to say that particular 
directories shouldn't get backed up. The attached patch adds 
the --exclude-if-present option. It has been tested with 1.0.4 and 1.0.5.

I documented it on the wiki at 
http://wiki.rdiff-backup.org/wiki/index.php/ExcludeIfPresent .

Thanks,
Jeff Strunk
IT Administrator
Enthought, Inc.

rdiff-backup-presence.diff
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