Flat field method

[wtgee]

This method has been used off and on variously for a while. Ideally should be decoupled more from the hardware but getting it committed as is.

Replaces and closes #729.

Taken from #1167.

[codecov[bot]]

Codecov Report

Merging #1173 (88adae9) into develop (4908119) will decrease coverage by 8.24%. The diff coverage is 60.53%.

@@             Coverage Diff             @@
##           develop    #1173      +/-   ##
===========================================
- Coverage    83.08%   74.83%   -8.25%     
===========================================
  Files           86       91       +5     
  Lines         7425     7809     +384     
  Branches       635      866     +231     
===========================================
- Hits          6169     5844     -325     
- Misses        1083     1824     +741     
+ Partials       173      141      -32     

Impacted Files	Coverage Δ
src/panoptes/pocs/camera/gphoto/remote.py	0.00% <0.00%> (-21.57%)	:arrow_down:
src/panoptes/pocs/sensor/power.py	40.23% <0.00%> (-1.74%)	:arrow_down:
...rc/panoptes/pocs/state/states/default/analyzing.py	5.55% <0.00%> (-54.45%)	:arrow_down:
src/panoptes/pocs/state/states/default/tracking.py	6.66% <0.00%> (-76.67%)	:arrow_down:
src/panoptes/pocs/utils/cli/main.py	0.00% <0.00%> (-70.00%)	:arrow_down:
src/panoptes/pocs/utils/database.py	0.00% <0.00%> (ø)
src/panoptes/pocs/utils/error.py	0.00% <0.00%> (ø)
src/panoptes/pocs/utils/logger.py	100.00% <ø> (ø)
tests/test_ioptron.py	66.66% <0.00%> (+0.70%)	:arrow_up:
...rc/panoptes/pocs/state/states/default/observing.py	14.28% <16.66%> (-61.91%)	:arrow_down:
... and 70 more

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