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Enable multithreading assembly

Santiago Ospina De Los Ríos requested to merge featature/multithreading-assembly into master

This MR implements multi-threading assembly of residuals and jacobians.

  • Depending on how much work is done in the assembly compared to the linear solver, these changes may give quite an speed up.
  • Multi-threaded or sequential can be chosen at run-time.
  • Synchronization mechanism between entity lock and coloring can also be chose at run-time.
  • Ideally, people would have METIS installed, otherwise we fall back to a very simple partitioning of the grid. The number of patches of the partition are also a new run-time parameter.
  • This needs a quasi-experimental branch from pdelab and the dune-assembler port.

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