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Create HomogeneousStretch module for FieldConvert

Douglas Serson requested to merge feature/FCHomogeneousStretch into master

This MR introduces a new module to FieldConvert, which extends the span of a 3DH1D field (only for integer factors). For example, we might want to double the span and obtain the correct duplicated periodic solution.

This is achieved by moving coefficients between planes so that they are at the correct wave number in the extended domain.

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