Planner: show gas for the NEXT segment

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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