Fix merging of weight systems

I just tried downloading some duplicate dives I had on my second dive
computer, and it all "just worked" and subsurface merged them for me.
Almost perfectly.

I say "almost", because in merging them, it threw my old weightsystem
data away, due to that not being merged.

Also, it was a perfect merge only because the computers are so similar
that they just line everything up - same water activation logic, same
sample interval, same pretty much everything. So while I know the
sample merging is not really the right thing to do (it was designed to
get the "merge the exact same dive from the same computer" case
right), it worked well enough for this particular case. I'll look at
something better later.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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