Feature Updates

• Feature: add scf_thr_type to choose the convergence criterion of scf calculation

• Feature: add an interface function for LCAO deepks

• Feature: pack EXX-process to Exx LRI interface

• Test: add unit tests for exx 

More information about latest updates (e.g. Test, Refactor, Bug fix and Documentation) can be found on our Github or Gitee repositories