Merge remote-tracking branch 'linus/master'
This branch adds a utility function that can be used to visualize the structure of a 2D grid, including indices of cells, edges, vertices. It was written by Linus Seelinger (who is currently a HiWi in Heidelberg) and has already proven very useful while debugging some YaspGrid issues. It is entirely self-contained and should thus not have any impact on the remainder of dune-grid. Linus has also written a unit test. * linus/master: Add a grid visualization tool 'printgrid' that uses gnuplot to show the grid structure, indices etc. (cherry picked from commit 1190e518) Signed-off-by: Steffen Müthing <firstname.lastname@example.org>
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