Disropt

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* Added Distributed Primal Decomposition for MILPs
* Added Max-consensus
* Added path graph utility
* Communicator: various improvements, added stop event
* Constraint exchange algorithms: added stop event
* Distributed Primal Decomposition: added stop event and computation of running average
* Improved documentation
* Fixes to ASYMM and block subgradient method

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* Distributed Simplex algorithm
* Improvements to MPI communicator
* LP utils
* Ring graph utility

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* Constraints Consensus: various fixes, example added
* Dual subgradient and primal decomposition: added callback function
* Added utils for time-varying graphs
* Docs and examples improved
* Bug fix

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* Submodular function
* Bug fix

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* Constraints Consensus algorithm

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* Added division operator for functions
* Added Power function