Remove dive info frame

Remove dive info frame

It has always been problematic, and I've been moving things in and out
of it.

And it just isn't a very powerful widget.  You can't *do* anything with
it.  The information it shows you may be useful, but the core stuff
already shows up in the dive list.

And the dive list is actually a much superior widget over that static
dive info frame.  The information that shows up in the dive list can be
sorted by column, for example.

So when we show temperatures or SAC numbers in the dive info frame,
that's actually a very bad place to show them: we would be much better
off showing it in the dive list, and then we could sort by SAC or by
temperature.

In other words: just remove the thing.  Instead, plan to extend the dive
list to contain all the information.  That will probably mean that we
need to change the current pane widget to be a vertical pane, rather
than a horizontal one, but what's wrong with that?

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>