Doc fixes for TridiagSolver (local) and removal of unused GPU kernels

[albestro]

Just a couple of minor fixes:

• Doc fix: local permutation i5 does not sort upper, dense and lower eigenvectors
• Round of cleanup of GPU kernels/functions:
  • initIndex
  • sortIndex (mergeIndicesOnDevice)
  • invertIndex
  • applyIndex
  • calcTolerance (maxVectorElement)
  • initColTypes (setColType

[albestro]

cscs-ci run

[albestro]

cscs-ci run

[codecov-commenter]

Codecov Report

Merging #971 (132f90d) into master (52704e9) will increase coverage by 0.51%. Report is 1 commits behind head on master. The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master     #971      +/-   ##
==========================================
+ Coverage   93.42%   93.94%   +0.51%     
==========================================
  Files         143      143              
  Lines        8686     8684       -2     
  Branches     1118     1113       -5     
==========================================
+ Hits         8115     8158      +43     
+ Misses        383      338      -45     
  Partials      188      188              

Files Changed	Coverage Δ
include/dlaf/eigensolver/tridiag_solver/kernels.h	100.00% <ø> (ø)
src/eigensolver/tridiag_solver/kernels.cpp	100.00% <ø> (ø)
src/eigensolver/tridiag_solver/kernels.cu	82.97% <ø> (+38.15%)	:arrow_up:
...af/eigensolver/tridiag_solver/index_manipulation.h	100.00% <100.00%> (ø)
include/dlaf/eigensolver/tridiag_solver/merge.h	99.18% <100.00%> (+<0.01%)	:arrow_up:

... and 7 files with indirect coverage changes

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