planner: remove DivePlannerPointsModel::startTimeChanged signal

The way the starting time of a new plan was set was bonkers:

1) PlannerWidgets::planDive() invokes DivePlannerPointsModel::
   createSimpleDive().

2) createSimpleDive() calls DivePlannerPointsModel::
   setupStartTime()

3) setupStartTime() emits a signal startTimeChanged()

4) startTimeChanged is caught by PlannerWidget and sets
   the UI field

5) change of the UI field emits a timeChanged() signal which
   is connected to DivePlannerPointsModel::setStartTime()

6) setStartTime() sets the time of the plan and displayed_dive
   and emits dataChanged()

7) dataChanged() replots the dive()

8) Back in DivePlannerPointsModel::createSimpleDive() the diveplan
   start time is overwritten with displayed_dive (the value are
   equal owing to 6)

Wow!

But it gets worse:

9) The initial dive plan is set up in createSimpleDive().

Since the profile is drawn in 7) after clearing the displayed_dive
and before constructing the initial plan, the profile is shown
on a dive without samples. It therefore generates a dummy profile.

To make this somewhat less insane, remove the startTimeChanged()
signal in 3), explicitly set the start time of plan and dive to
the one calculated by setupStartTime() and explicitly set the UI
filed in the plannerWidget.

This still indirectly draws the profile via signals in a convoluted
way, but at it straightens out things somewhat. Most importantly,
the profile doesn't have to generate a fake DC.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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