For deco stops show the gas of the next segment in the table. In
recalculation remove old deco stops earlier.
In struct diveplan, the items are "segments" with a beginning, a duration,
and a gas. In contrast, the UI of the planner uses "waypoints" which are
the boundaries between segments. It is conventional at least for deco
stops to display the gas of the _next_ segment in the runtime table (i.e.
the gas possibly to be switched to).
Furthermore, in addStop, the old deco stops have to be removed earlier as
otherwise a new waypoint later than a previous generated gas switch
inherits the gas of the old switch.
Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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