Split a dive by time

[Dirk Hohndel]

> On Jul 1, 2018, at 2:43 PM, Linus Torvalds <torvalds at linux-foundation.org> wrote:
> 
> Ok, fixed that too, and now I can take Alberto's dive, and do "split
> selected dive" on it to get the four non-surface parts, and then
> stitch the three quick dips that were part of the rescue dive back
> into one dive, ending up with two dives.
> 
> If somebody wants to have a manual "split at this point" UI, that's
> fine too, but these fixes for the automatic case do actually fix real
> issues and make it possible to do this all using the existing UI.

I find it really hard to believe that people would want to split dives in
spots that aren't "basically surface"... but hey, I've been wrong before.
:-)

> Pull request done on github.

Thank you kindly.

/D