Point search fails for manifolds

[Martin Sandve Alnæs]

Attached a simple py.test test that creates a two-triangle mesh in 3D and fails to pick the closest cell for one of the two cell midpoints. (For all I know it could fail for all manifolds, I've only tested with this simple mesh).

@logg @augustjohansson @benjamik

[Chris Richardson]

Fix Issue #542

→ <<cset 89719b76de2d>>

[Anders Logg (Chalmers)]

Removing milestone: 1.7 (automated comment)