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Matrix assembly

James Sutherland requested to merge matrix-assembly into master
  • Enables assembly of matrices for eigenvalue analysis and block-implicit time integration with expressive syntax in matrix construction and arithmetic.
  • Enables specification of a subset of variable and right-hand side indices in the matrix, and allows variable index =/= rhs index for control of matrix structure.
  • Removes dual time oscl ad hoc sens test in favor of a test that builds an assembler through a product of assemblers, and tests permutations of variable, rhs, and primitive variable orderings.
  • Adds an 'ecology example' to demonstrate how the new dual time integration and matrix assembly can be used.

This removes the chain rule assembler and in-expression matrix mod code that Zodiac depends on - the 'better assembly' merge request in Zodiac removes this dependency.

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