Remove duplicated code in GridFuncVector

[jeanlucf22]

No description provided.

[codecov-io]

Codecov Report

Merging #172 (28e948c) into release (0fec8c0) will increase coverage by 0.25%.
The diff coverage is 77.12%.

@@             Coverage Diff             @@
##           release     #172      +/-   ##
===========================================
+ Coverage    54.86%   55.11%   +0.25%     
===========================================
  Files          384      388       +4     
  Lines        37499    37611     +112     
===========================================
+ Hits         20572    20728     +156     
+ Misses       16927    16883      -44     

Impacted Files	Coverage Δ
src/AOMMprojector.cc	0.00% <0.00%> (ø)
src/ChebyshevApproximationInterface.h	100.00% <ø> (ø)
src/DensityMatrixSparse.h	100.00% <ø> (ø)
src/DistMatrix2SquareLocalMatrices.h	100.00% <ø> (ø)
src/ExtendedGridOrbitals.h	73.33% <ø> (ø)
src/Forces.h	100.00% <ø> (ø)
src/GrassmanCG.cc	0.00% <0.00%> (ø)
src/GrassmanCGSparse.cc	0.00% <0.00%> (ø)
src/Hamiltonian.h	100.00% <ø> (ø)
src/HamiltonianMVPSolver.cc	85.81% <ø> (ø)
... and 92 more

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