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Fix block preconditioner to work with periodic boundary conditions

Dave Moxey requested to merge dmoxey/nektar:fix/block-periodic into master

This MR introduces a streamlined version of the block preconditioner that works for problems with periodic boundary conditions in 2D and 3D. It also adds a new preconditioner metric for the test suite that allows for an integer tolerance defined in the .tst file, and fixes a potential bug with periodic edges in parallel inside AssemblyMapCG.

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