CartesianConvolution

[stigrj]

• Update to new MRCPP-v1.5
• Add interface to gauge-like operators (e.g. xy/r^3)

[codecov]

Codecov Report

Patch coverage: 92.30% and project coverage change: +0.21 🎉

Comparison is base (1bfb61c) 83.64% compared to head (9e66def) 83.85%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #98      +/-   ##
==========================================
+ Coverage   83.64%   83.85%   +0.21%     
==========================================
  Files          22       22              
  Lines         868      892      +24     
==========================================
+ Hits          726      748      +22     
- Misses        142      144       +2     

Impacted Files	Coverage Δ
src/vampyr/operators/derivatives.h	92.30% <ø> (-0.55%)	⬇️
src/vampyr/operators/convolutions.h	93.58% <92.30%> (-0.75%)	⬇️

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[robertodr]

The repo2docker build failure is unrelated, though I'm not quite sure how to fix it.