Unitary constraints and other clean ups

[codecov[bot]]

Codecov Report

Merging #58 (d43099f) into master (71bdf35) will decrease coverage by 0.07%. The diff coverage is 95.00%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
- Coverage   94.83%   94.76%   -0.08%     
==========================================
  Files          13       13              
  Lines        1723     1776      +53     
==========================================
+ Hits         1634     1683      +49     
- Misses         89       93       +4     

Impacted Files	Coverage Δ
src/objective.jl	81.57% <66.66%> (-3.43%)	:arrow_down:
src/variables.jl	92.42% <80.00%> (+0.62%)	:arrow_up:
src/data.jl	92.89% <83.33%> (-0.45%)	:arrow_down:
src/constraints.jl	96.77% <100.00%> (+0.37%)	:arrow_up:
src/gates.jl	100.00% <100.00%> (ø)
src/log.jl	89.47% <100.00%> (-0.53%)	:arrow_down:
src/qc_model.jl	96.09% <100.00%> (+0.36%)	:arrow_up:
src/types.jl	100.00% <100.00%> (ø)
src/utility.jl	94.75% <100.00%> (-0.28%)	:arrow_down:
... and 3 more

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