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Optimisations for DG code

Dave Moxey requested to merge feature/DGopt into master

This MR adds optimisations for DG code. This is achieved by preprocessing the mesh topology to identify similar interpolation methods that can be blocked together and generating longer scatter and gather mappings. These are then used in the GetFwdBwdTrace method as well as AddTraceIntegral type methods. This has been introduced in 2D and 3D but not 1D.

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