[PATCHES] Two patches for dive plan

[Robert Helling]

Rick,

> Am 24.11.2016 um 04:10 schrieb Rick Walsh <rickmwalsh at gmail.com>:
> 
> One question: is there a reason why we can't access displayed_dive.dc.duration.seconds instead of creating a new function to iterate through all the data points to get the runtime?

I found that displayed_dive.dc.duration.seconds as well as displayed_dive.duration.seconds at least sometimes is still 0 at the time when the notes are assembled. I did not investigate this further (maybe I should), but rather wrote this helper function to compute it from the struct diveplan.

Best
Robert
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