Inifinite Phase Screen startup performance improvement

[andrewpaulreeves]

The infinite phase screen code spends a lot of time "calculating seperations" as it does nested Python loop. Its much quicker re-implemented in Numba. Optional import so code still works without Numba, just slower.

[codecov[bot]]

Codecov Report

Merging #57 into master will decrease coverage by 1.27%. The diff coverage is 30.76%.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   94.97%   93.70%   -1.28%     
==========================================
  Files          24       24              
  Lines        1175     1191      +16     
==========================================
  Hits         1116     1116              
- Misses         59       75      +16     

Impacted Files	Coverage Δ
aotools/turbulence/infinitephasescreen.py	86.09% <30.76%> (-10.21%)	:arrow_down:

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[matthewtownson]

That is a lot faster! Thanks.