add off diagonal approximation

[PierreMarchand20]

No description provided.

[codecov]

Codecov Report

Base: 98.84% // Head: 98.38% // Decreases project coverage by -0.46% ⚠️

Coverage data is based on head (b332084) compared to base (e73e70b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
- Coverage   98.84%   98.38%   -0.47%     
==========================================
  Files           8        9       +1     
  Lines         346      433      +87     
==========================================
+ Hits          342      426      +84     
- Misses          4        7       +3     

Impacted Files	Coverage Δ
src/htool/ddm_solver.hpp	97.29% <ø> (-2.71%)	⬇️
src/htool/cluster.hpp	96.42% <100.00%> (-0.84%)	⬇️
src/htool/hmatrix.hpp	98.01% <100.00%> (-0.76%)	⬇️
src/htool/lrmat_generator.hpp	100.00% <100.00%> (ø)
src/htool/main.cpp	100.00% <100.00%> (ø)
src/htool/off_diagonal_approximation.hpp	100.00% <100.00%> (ø)

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