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[md][bugfix] Fix memory leak due to cyclic shared_ptr dependency couplingmanager<->problem

Timo Koch requested to merge fix/md-memoryleak-couplmanager-problem into master

The coupling manager had a shared_ptr to the problem and the problem to the coupling manager. This cyclic dependency leads to neither the problem nor the coupling manager being destroyed -> huge memory leaks.


  • fix embedded coupling managers
  • fix facet coupling managers
  • fix boundary coupling managers
  • check with valgrind that there are no memory leaks

Fixes #557 (closed).

Edited by Timo Koch

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