Root Heuristics (RINS, CPU FJ)

[nguidotti]

• Refactored the root heuristics (more specifically, the CPU FJ launches at the root node) to be more modular, while allowing to use more workers.
• Extended recursive RINS to run on the root node
• Fixed incorrect objective passed to the set_solution_from_submip (the objective was on the submip space, which is not comparable with the solution space of the B&B).

Checklist

• I am familiar with the Contributing Guidelines.
• Testing
  • New or existing tests cover these changes
  • Added tests
  • Created an issue to follow-up
  • NA
• Documentation
  • The documentation is up to date with these changes
  • Added new documentation
  • NA

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