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Feature: mix density matrix by the coefficients of charge density mixing #3535

@WHUweiqingzhou

Description

@WHUweiqingzhou

Background

Now, ABACUS mix charge density each iteration. For some calculations which require density matrix, the mixture of density matrix is also needed.
Now I use plan-2 and implement it in PR #3549

Describe the solution you'd like

  1. construct initial density matrix, and mix it as same as charge density.
    Issue Feature: require initial density matrix for further density matrix mixing #3536
  2. enable ABACUS to restart mixing during SCF after certain steps.
    Issue Feature: enable ABACUS can restart mixing during SCF #3538
    PR Feature: enable restart charge density mixing during SCF #3542

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