More flexible solve options

[wtgee]

• Fix a usage problem where you either had to pass all possible desired options or just accept most of the defaults.
• Changes default options in get_solve_field to use scale-low and scale-high instead of radius (which requires an ra and dec).
• Fixes bug where args and kwargs weren't being properly passed in getdata.

This PR fixes so that you can pass args and kwargs to solve-field and they will be added to the list of default options.

These currently will not override the defaults, which would be desirable, but merely allow you to specify additional options in addition to the default.

[codecov[bot]]

Codecov Report

Merging #180 into develop will increase coverage by 0.18%. The diff coverage is 92.30%.

@@             Coverage Diff             @@
##           develop     #180      +/-   ##
===========================================
+ Coverage    70.48%   70.66%   +0.18%     
===========================================
  Files           26       26              
  Lines         1853     1851       -2     
  Branches       248      249       +1     
===========================================
+ Hits          1306     1308       +2     
+ Misses         486      482       -4     
  Partials        61       61              

Impacted Files	Coverage Δ
panoptes/utils/images/fits.py	80.72% <92.30%> (+1.86%)	:arrow_up:

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