Profile: adjust tank pressures at gas change (incomplete)

This code sets up the UI that will allow the user to adjust tank pressures
at a gaschange event. The actual changing of the pressure is not
implemented, yet, so this is disabled until someone finds time to do so.

The scenario is this: a tec diver or sidemount diver without pressure
sensors on at least one of their tanks still wants to reasonably
accurately track gas consumption during a dive. The diver takes notes of
the pressures at every tank switch (I find that odd, but apparently some
cave divers indeed do that as they switch back and forth between different
gases) and then wants to adjust the pressures in Subsurface to match those
written down.

One difficulty here is that the first and last pressure of a tank with no
sensor data is still considered "sensor pressure" - this is basically an
implementation detail in the code that is used to do the pressure
interpolation to have constant-SAC pressure plots for tanks without
sensors. So when we check if there is indeed no pressure data available at
the gas change, we can't just work with the interpolated pressure - if
this is the first (or last) time the tank was used, that pressure may be
marked as sensor pressure.

What's missing is the UI to enter the desired new pressure plus the black
magic that actually inserts this into the dive in a way that doesn't break
the assumptions in the rest of the code. I'm running out of time to do
that but wanted to preserve this code so someone can continue this later.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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