Illumination and precon

[mloubout]

Revives illumination operator, supersedes #90

Fixes #48

[codecov]

Codecov Report

Base: 84.10% // Head: 82.36% // Decreases project coverage by -1.73% ⚠️

Coverage data is based on head (2744845) compared to base (fbb2168).
Patch coverage: 73.22% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
- Coverage   84.10%   82.36%   -1.74%     
==========================================
  Files          25       28       +3     
  Lines        2000     2143     +143     
==========================================
+ Hits         1682     1765      +83     
- Misses        318      378      +60     

Impacted Files	Coverage Δ
src/rrules.jl	74.07% <0.00%> (-9.26%)	⬇️
...imeModeling/Preconditioners/DataPreconditioners.jl	60.36% <60.36%> (ø)
...meModeling/Preconditioners/ModelPreconditioners.jl	67.96% <67.96%> (ø)
src/TimeModeling/Types/ModelStructure.jl	86.53% <68.42%> (-0.31%)	⬇️
src/TimeModeling/Preconditioners/base.jl	72.72% <72.72%> (ø)
src/TimeModeling/Utils/auxiliaryFunctions.jl	78.93% <74.19%> (+0.27%)	⬆️
src/TimeModeling/Modeling/misfit_fg.jl	89.55% <75.00%> (-3.67%)	⬇️
src/TimeModeling/Preconditioners/utils.jl	90.90% <90.90%> (ø)
src/TimeModeling/Modeling/python_interface.jl	99.15% <97.82%> (-0.06%)	⬇️
src/JUDI.jl	88.88% <100.00%> (+0.65%)	⬆️
... and 5 more

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