Feature Updates

• Feature: add macro definition _DEBUG for test-only message

• Feature: change output format related with Hefei-NAMD

• Feature: add out_app_flag to control whether output matrix in an append manner 

• Feature: enable three different precision levels for variable-cell MD

• Build: add support for libxc 6.1

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