Mpi adder

added 31 commits

• e36bd9bf...a4e43a99 - 12 commits from branch master
• d3bd50f1 - Add mpi demo script
• be48b966 - Work on MPI demo
• eb346ac1 - Work on MPI demo
• 26eea60a - Gradients working
• eb5d97cb - Metric working
• 91c87f21 - Cleanup
• af151b84 - Cosmetics
• 93718c2f - Fix adjoint direction with MPI
• 74c31db9 - Fix metric
• bf78fbe8 - Add MPI Sampling distributor
• 1a433803 - Massive simplification
• a25eceee - More simplifications
• 76873709 - Add more checks
• 9f3c867e - Simplify
• 27ce1d93 - Actually test something
• a32e6c2b - First working version
• f4dada54 - Cosmetics
• b7dea061 - Remove debugging calls
• 41b3caae - Simplify

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added 3 commits

• 1238a169 - Refactor
• 6d1ffe08 - Test fixups
• 1281a17c - Better interface

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added 1 commit

• 94d456e1 - Fixup

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added 1 commit

• 21aaa483 - Fixup

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added 1 commit

• 656ea0f8 - Fixup

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added 1 commit

• f09f19e2 - Generalize to case where some tasks are empty

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added 1 commit

• 424c2ced - Add inits for coverage to work

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marked this merge request as ready

added 2 commits

• 77be8ecd - Generalize MPI support
• 40c262b5 - Cosmetics

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merged

mentioned in commit 48499441