Batchify the imaginary time propagation eigensolver

Description

Batchify the imaginary time propagation eigensolver. This adding the option of using an imaginary time to the exponential methods.

Checklist

• I have checked that my code follows the Octopus coding standards

changed milestone to %10.0

added Optimization Refactoring labels

Codecov Report

Merging #652 into develop will increase coverage by 0.02%. The diff coverage is 81.15%.

@@             Coverage Diff             @@
##           develop     #652      +/-   ##
===========================================
+ Coverage     70.8%   70.82%   +0.02%     
===========================================
  Files          471      471              
  Lines        89329    89362      +33     
===========================================
+ Hits         63251    63293      +42     
+ Misses       26078    26069       -9

Impacted Files	Coverage Δ
src/system/eigensolver.F90	95.89% <ø> (ø)
src/system/exponential.F90	80.24% <75%> (-1.53%)
src/system/eigen_evolution_inc.F90	88% <83.01%> (-2.39%)
src/grid/mesh_batch_inc.F90	80.04% <0%> (+2.72%)
src/basic/cublas.cc	51.85% <0%> (+5.55%)
src/math/accel_blas_inc.F90	50% <0%> (+11.53%)

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added 1 commit

• dbaace4d - Update test references.

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added 2 commits

• 35595511 - Do no copy data when unpacking psib after computing eigenvalues and residues,...
• 2f88733a - Fix incorrect calculation of residue.

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merged

mentioned in commit 0d725e2d

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