Replace mpirun with mpiexec, as only the latter is in the standard
PCHPDDM: check --with-debugging that -pc_hpddm_has_neumann is correctThanks-to: Eric Chamberland @eric.chamberland, Félix Kwok <felix.kwok@mat.ulaval.ca>
PCHPDDM: switch to native SLEPc options- Deprecate -eps_threshold in favor of -eps_threshold_absolute- Deprecate -eps_relative_threshold in favor of -eps_threshold_relative- Deprecate -svd_relati
PCHPDDM: switch to native SLEPc options- Deprecate -eps_threshold in favor of -eps_threshold_absolute- Deprecate -eps_relative_threshold in favor of -eps_threshold_relative- Deprecate -svd_relative_threshold in favor of -svd_threshold_relative- More flexibility to users, e.g., one can now supply -svd_threshold_relative but not -svd_nsv
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PCHPDDM: small fixes in petsc4py demo
PCHPDDM: move Python examples into petsc4py source treeSee also: https://gitlab.com/petsc/petsc/-/issues/1644