Adding files, dead revisions

[Cameron, Steve]

I noticed some comments in sanity.sh,
around "join-19" that made me think that 
when adding a file to the trunk, perhaps a
dead revision should be added first, then 
the new revision added as a change to that
dead revision, similar to what's done for
adds to a branch.  

Is there a reason this isn't done?  Just wondering.

(I guess it would mean all files would start off with
revision 1.2..., and people would probably complain
about that...)

-- steve