Feature request: svnadmin load shouldn't load existing revisions

Hi!

I just made a stupid mistake that cost me a few hours for loading a multi-GiB
repository. What I did was to load a repository from a backup dumpfile, which
went to revision 37344 (and took several hours). I then proceeded to create
an incremental dumpfile from the life repository, and made an off-by-one
mistake there:

  svnadmin dump --incremental -r 37344:HEAD ...

I then copied the dumpfile to a different machine and loaded it there, but
after the first revision SVN told me that it "Committed new rev 37345 (loaded
from original rev 37344)" which is exactly _not_ what I wanted, because now
the new repository is unusable with existing working copies because its
revisions are one off.

Two things where I think svnadmin could do better:
1. The dump was incremental
I would expect that this requires some checking if the "patch" can actually be
applied. Maybe it's just my bad luck that there were no conflicts that caused
loading the dumpfile to fail.

2. The revision numbers don't match
My call basically means that I'm telling svnadmin to create a revision that
already exists. Instead of renumbering the revision, bailing out with an
error would have been a good idea. Of course, there are legitimate cases
where this is needed, so a commandline switch would be needed to override
this check, but by default I would refuse loading the dumpfile. Maybe also
skipping existing revisions would be an option, at least I would have found
that helpful.

Thanks!

Uli

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