[PATCH] Planner - change timestep to 2 seconds

[Rick Walsh]

Change the timestep used to calculate tissue pressures and ascents from 3
seconds to 2 seconds.  But whats wrong with using 3 seconds?

Deco stops are at 3 m (10') intervals, and our ascent rate is usually 9 m/s
(30'/s), or at least multiples of 3 m/s (10'/s).  Hence time to ascend from
one stop to the next stop is 20 s (or any factor of 60).  Using 3 s
increments, we round our ascent interval up to 21 s, which leads to messy
durations and runtimes.

But what about me?  I like SI units and whole decimals.  Don't worry, 2 s
timesteps fit nicely when using 10 m/s ascent rate (18 s between stops).

Cheers,

Rick
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