Use primme_smallest instead of primme_closest_geq on xDMRG eigs optimization.
Use primme_smallest instead of primme_closest_geq on xDMRG eigs optimization.

* Seemed to work better, trying it for a while

DavidAce/DMRG,DavidAce/DMRG,DavidAce/DMRG,DavidAce/DMRG