[Patches] Planner minimum gas switch duration

[Rick Walsh]

Hi,

Here are two patches to set a minimum stop duration for any gas change.
The first patch adds a spinbox so the user can select what the duration
should be - up to 9 minutes, with 0 giving the previous behaviour.  The
second patch enforces the minimum stop for gas changes.

The notes output logic isn't affected by these patches, but I'll keep
trying to tackle that and this will help sort out what to do with gas
changes.

Cheers,

Rick
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