Replace alpha value of gray star with lighter gray

It seems, on Linux qrgba does not work properly making
stars with alpha red when selected. So the patch returns
to just rgb without transparency but decreases the contrast
to white by a factor of 5.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Don't track gas consuption on CCR legs

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Prepare for PSCR calculations

Calculations for passive semi-closed rebreathers are pretty much like OC
except the pO2 is lower bey a certain (SAC dependent) factor. This patch
introduces the corresponding calculations in case dctype == PSCR which is
so far never set and there is currently no UI for these calculations. As
pO2 is SAC dependent it takes a certain attempt at getting it and drops to
defaults from the prefs otherwise.

As there is no UI at this point and I also don't have any dives, this has
not received much testing, yet, but it compiles. At least.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Offer to save to a copy in replan mode

When replannig a dive, offer another button that creates a new
dive rather than overwriting the old. This should help in creating
several versions of a planned dive (longer/shorter, deeper/shallower
etc). Note that this makes dives that start at the same time not
influcence each other's deco.

Also, only the first of a row of simultaneous dives contributes to
the tissue loadings of later dives.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>