Construct affine transforms from point-pairs

[timholy]

Given a set of point pairs from => to, compute the affine transformation that best reproduces the observed mapping.

Closes #30

[codecov[bot]]

Codecov Report

Merging #87 (9e67de2) into master (78f5a5c) will increase coverage by 2.63%. The diff coverage is 58.82%.

:exclamation: Current head 9e67de2 differs from pull request most recent head ff37a34. Consider uploading reports for the commit ff37a34 to get more accurate results

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   63.90%   66.54%   +2.63%     
==========================================
  Files           4        4              
  Lines         266      275       +9     
==========================================
+ Hits          170      183      +13     
+ Misses         96       92       -4     

Impacted Files	Coverage Δ
src/affine.jl	56.97% <53.33%> (+8.87%)	:arrow_up:
src/coordinatesystems.jl	79.28% <100.00%> (+0.30%)	:arrow_up:

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