Support for complex hermitian matrix

[Eta-Chu]

I notice that in arpack there is no special implement for symmetry complex matrix.
And in arpack document, it's suggested that call znaupd for both Hermitian and non-Hermitian problems.
But using lanczos for Hermitian complex matrix can reduce cost.

[yixuan]

Hi @Eta-Chu, the complex Hermitian solver has been added in v1.1.0. You can find the documentation here.