Provide planner option to switch gas only when a stop is required

[Robert C. Helling]

Hi,

> On 22 Jun 2015, at 16:26, Rick Walsh <rickmwalsh at gmail.com> wrote:
> 
> These patches add the planner option to postpone a gas switch to the next required stop.  I haven't managed to make it do silly things, but please do check when you get a chance - no rush apply.
> 
> The option is ignored when the current gas is hypoxic.

the patches look good to me. Still I don’t know if there is really a use case for this in the planner that justifies the addition of a checkbox. Anton? Dirk?

Regarding hypoxic gases: So far we allowed switching to those and displayed a warning in the notes. But maybe this is the better approach. Maybe we should use a #define in the planner for the minimal ppO2 (160mbar) rather than hardcoding that number (of course I did that as well in the part that does the warning).

Best
Robert
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