bugfix, cleanup: simplify stopwatch logic and fix fallout The previous 2 commits (making the depth switch between surface and diving consistent) increased the time difference (in the simulator) to about 4 seconds. This commit fixes this again, and we are back at 1 sec. difference between the 2 timers (notice: in the simulator). Still not the wanted 0 sec. difference, but the old stopwatch logic logic was rather convoluted. Resetting to 1 second (instead of 0), and second-1 logic. Basically, this feels like a bug fixed with a second bug on top to mask it. The code is now much more logic and consistent (despite the fact that the real reason for the 1 sec. difference is not yet found). Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>