This removes PEEP control, and wires up the controller with the hardware

[mschottdorf]

1. Fixed the hardware issues, i.e. correct pressure measurements.
2. Allows closed loop PID and state control.
3. Default is PID control (seems to work better). On the dinky with these results:

Note: Installed was a 5 cm H2O PEEP valve, so this is not software controlled.

This is from a different run, where you can see control-in, and fast out

[coveralls]

Pull Request Test Coverage Report for Build 422

• 33 of 58 (56.9%) changed or added relevant lines in 2 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.6%) to 79.831%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
vent/controller/control_module.py	30	55	54.55%
<!--	Total:	33	58	56.9%	-->

Files with Coverage Reduction	New Missed Lines	%
vent/controller/control_module.py	1	73.38%
vent/gui/widgets/status_bar.py	4	66.3%
<!--	Total:	5		-->

Totals
Change from base Build 407:	-0.6%
Covered Lines:	2652
Relevant Lines:	3322

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💛 - Coveralls

[zajdel]

Results look very nice. Looks like you're hitting the PIP fast and reliably!

[zajdel]

Also physically tested on the Dinky. I would say this is ready to merge.