Solve field fixes.

[wtgee]

• get_solve_field will only accept kwargs for passing to solve_field. Single keyword options should have a bool, e.g. {'--overwrite': True}

[codecov]

Codecov Report

Merging #189 into develop will increase coverage by 0.21%.
The diff coverage is 81.81%.

@@             Coverage Diff             @@
##           develop     #189      +/-   ##
===========================================
+ Coverage    72.39%   72.60%   +0.21%     
===========================================
  Files           26       26              
  Lines         1811     1814       +3     
  Branches       240      240              
===========================================
+ Hits          1311     1317       +6     
+ Misses         439      435       -4     
- Partials        61       62       +1     

Impacted Files	Coverage Δ
panoptes/utils/images/fits.py	82.05% <81.81%> (+1.32%)	⬆️
panoptes/utils/error.py	94.59% <0.00%> (+1.35%)	⬆️

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