--link-dest behavior

[Matthew Monaco]

Greetings All,

I've been thinking about the current behavior of the --link-dest=DIR
option.  In the absence of --delete, ALL members of DIR should be linked
to the destination (aside from those that are changed).  If not, there
should at least be a --no-link-dest-delete option.  (This latter option
might be better to avoid disrupting the behavior of current rsync commands)

My rational: This would benefit a snapshot-style backup system, where
the user wants to accumulate files without deleting them from the
destination.  With this behavior the user would not need to search
through scores of snapshots to find a file that is no longer in the source.


-Matt