further feature updates

[ConnorStoneAstro]

including: automatic sip backwards coefficients

[codecov]

Codecov Report

❌ Patch coverage is 95.04000% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.54%. Comparing base (e225e20) to head (4996602).
⚠️ Report is 48 commits behind head on dev.

Files with missing lines	Patch %	Lines
astrophot/fit/gradient.py	77.19%	13 Missing ⚠️
astrophot/fit/func/slalom.py	82.85%	6 Missing ⚠️
astrophot/fit/scipy_fit.py	70.00%	3 Missing ⚠️
astrophot/image/jacobian_image.py	66.66%	2 Missing ⚠️
astrophot/image/mixins/sip_mixin.py	93.75%	2 Missing ⚠️
astrophot/fit/func/lm.py	97.14%	1 Missing ⚠️
astrophot/fit/lm.py	97.67%	1 Missing ⚠️
astrophot/image/cmos_image.py	92.30%	1 Missing ⚠️
astrophot/models/point_source.py	87.50%	1 Missing ⚠️
astrophot/utils/interpolate.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #268      +/-   ##
==========================================
+ Coverage   90.30%   91.54%   +1.24%     
==========================================
  Files         111      113       +2     
  Lines        4858     5039     +181     
==========================================
+ Hits         4387     4613     +226     
+ Misses        471      426      -45     

Flag	Coverage Δ
unittests	91.54% <95.04%> (+1.24%)	⬆️

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