Close snprintf warning

Gcc yells:
warning: format not a string literal and no format arguments

This closes that warning.

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

The checkbox is remembered as long as the program is still running, so
if you planned one dive with drop_stone_mode and saved/aborted and then
tried to plan another one we had a first "down" waypoint from
createSimpleDive and drop_stone_mode was also enabled.

This makes sure we don't add the first waypoint in createSimpleDive when
drop_stone_mode is enabled and lets that add a implicit first waypoint.

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Emit signal on photo double-click

Signed-off-by: Sergey Starosek <sergey.starosek@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Start external viewer on photo double-click

Signed-off-by: Sergey Starosek <sergey.starosek@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Better date localization

Instead on relying on the translators to correctly format date and time we
should be able to get all we need from QLocale. Sadly this takes a bit of
hacky post-processing, but in my limited testing the results look good.

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