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Support cyclic grids for LAGRANTO interpolation

Christoph Fischer requested to merge devel_issue_228 into master

The problem is that contrary to the trilinear interpolation, the LAGRANTO interpolation first interpolates the index to access the fields at consecutive time steps. This float-type index was not allowed to go past the index in the grid, stopping computations to pass the cyclic grid boundary.

Closes #228 (closed)

Edited by Christoph Fischer

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