Picture handling: when zooming thumbnail, put it in the foreground

This just seems to look much better.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Improve statistic on used gas

This raises the maximum number of gas mixes listed to 20 and also changes
the layout / design of the stats tab to make it much more attractive.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
More layout work for stats tab

This finally gets me something that I like. The way the different boxes
get resized seems pleasant and intuitive. And it appears to do the right
thing on all platforms (I learned that having different levels of layout
nested creates no vertical offset on Linux/KDE, but a very ugly offset on
Mac, for example).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Planner: fix the tab order

I know this is being redone, but the messed up tab order was driving me
insane when testing.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Remove unused variable

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Minor code readability improvement

Tomaz pointed out that this is a better way to create that pair.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Don't ignore actual diveable mixes

Fist is really obvious. I quite regularly decompress using pure O2.
It's as good a last decompression gas as you get.

The second is a bit harder. There are very few that dive with 80%+ helium
in their mixes but they exist, and there are real weirdos that dive
heliox, so they are actual diveable gases too.

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>