Be much saner about merging dive computer data

Now that we have dive computer device ID fields etc, we can do a much
better job of merging the dive computer data.

The rule is

 - if we actually merge two disjoint dives (ie extended surface interval
   causing the dive computer to think the dive ended and turning two of
   those dives into one), find the *matching* dive computer from the
   other dive to combine with.

 - if we are merging dives at the same time, discard old-style data with
   no dive computer info (ie act like a re-download)

 - if we have new-style dive computers with identifiers, take them all.

which seems to work fairly well.

There's more tweaking to be done, but I think this is getting to the
point where it largely works.

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

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