svn_fs_paths_changed node_rev_id field has always been broken on FSFS

Just a note --- this isn't a huge priority now, but might as well get
this in the archives.

cmpilato and I noticed that FSFS has always been buggy in writing out
changed-path entries to rev files. Specifically, the temporary
changed-paths entry in the transaction directory stores the
transaction node-rev-ID, not the final revision one;
write_final_changed_path_info is *supposed* to translate that into a
permanent node-rev-id, but the conditional is wrong: it only does the
conversion if the ID in question is a permanent ID, which is the
opposite of what is necessary.

We could just flip the ! in the conditional. You'd also probably need to
revert r27161; except I actually did r27161 for a reason (I worried
about corruption if a transaction was partway through being committed,
failed, and was later re-opened). Perhaps an in-memory hash mapping
temporary to permanent node-rev-IDs would be best.

--dave

-- 
David Glasser | glasser@davidglasser.net | http://www.davidglasser.net/
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