Updates for 0.2

[andrewpaulreeves]

• Add some more docs
• moving optical propagation from "turbulence" to top namespace, as its general propagation, not just for turbulence.
• Previously, if an inversion in the infinite phase screen failed (due to a linear algebra error using a Cholsky decomposition), a different method would be used. However, this resulted in unpredictable results. Now if the Cholsky fails, just throw and error. (Usually the error can be fixed by using a large (more course) pixel scale

[codecov-io]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##           master      #19   +/-   ##
=======================================
  Coverage   69.59%   69.59%           
=======================================
  Files          21       21           
  Lines         980      980           
=======================================
  Hits          682      682           
  Misses        298      298

Impacted Files	Coverage Δ
aotools/astronomy/_astronomy.py	14.28% <ø> (ø)
aotools/astronomy/__init__.py	100% <ø> (ø)	⬆️
aotools/turbulence/__init__.py	100% <ø> (ø)	⬆️
aotools/turbulence/infinitephasescreen.py	84.96% <0%> (ø)	⬆️
aotools/__init__.py	100% <100%> (ø)	⬆️
aotools/opticalpropagation.py	36.06% <100%> (ø)

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[matthewtownson]

Looks good