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Switch the order of grid1 and grid2 before projecting the faces

Jonathan Youett requested to merge rework/contactmerge_switch_projection into master

This switch has the advantage that the inverse projection is now unique on the grid1 side (formerly it was only the case on the grid2 side). In the mortar discretisation one integrates over the grid1 side and non-unique inverse projected corners lead to wrong contact constraints.

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