Hack to force plastique style on Linux

I'd much rather be able to check if it is using the Gnome style and only
then force plastique but I haven't been able to figure out how to do
that.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
List only the gases used in the Info tab

The equipment tab will still show all defined gases, but the info for
the dive should only list the ones used.

Also change the name of the two gas related boxes to better reflect the
data that is shown.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Show GF for calculated ceiling above the graph

The hardcoded position we previously had would make the text invisible
if a ceiling was drawn during the middle of the dive.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Scroll to (and re-expand) the selection when sorting and moving

The keyboard movement wouldn't scroll to the newly changed selection.
Similarly, when sorting the dive list, we'd end up losing the currently
selected dive (and generally collapsing the currently exposed trips).

This adds the scrolling/exposing logic for those cases.

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