Anil Mahmud

Add a shrink_to_fit function for the quadratic models.

2

**Application** It will shrink the size of the quadratic models to what is actually required. Though when creating the CQM through serialization we calculate how much memory will be required...

Ported DQM code to C++

2

Ported all the dqm code to C++. Not making any attempt to rebase with upstream/main since there is a lot of divergence now.