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New elpa_pxgemm_multiply function

Petr Karpov requested to merge peter_pxgemm_multiply into master_pre_stage

Major changes:

  • Introduced new function elpa_pxgemm_multiply -- matrix-multiplication via SUMMA algorithm. Now it's used for generalized eigenproblem transformation on GPU.
  • Added explicit interfaces for elpa_generalized_eigenvectors and elpa_generalized_eigenvalues, for example elpa_generalized_eigenvectors_double etc.

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