[PATCHES] Two patches for dive plan

[Robert Helling]

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Hi,

here are two patches to improve the dive plan. The first simply shows the total runtime on top of the plan. This is one of the most important data of a plan and should be visible while adjusting parameters of the plan. So it is very inconvenient if is scrolled out of the dive plan widget.

the second attempts to find an approximation of a VPM-B profile in terms of Buehlmann+GF parameters: For each stop it computes an effective gradient factor that would give a similar ceiling. Of all these computed gradient factors it does a linear regression to fit a line to these factors (this is what the Baker GF’s do). This line is then expressed as effective GFlow and GFhigh in the dive plan.

Note this is not the same as determining GFlow and GFhigh by requiring the first stop depth and total runtime to be the same, rather it optimizes the average gradient factor. In order to get the runtime right, one would mainly have to adjust GFhigh.

Best
Robert
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