1/ Bug fix: count hexes instead of quads for used_cells in 3d. Triggered no error before as always n_quads > n_hexes. 2/ Two doc fixes. 3/ Use of GeometryInfo::child_cell_on_face instead of searching through all children and faces.
1/ Bug fix: count hexes instead of quads for used_cells in 3d. Triggered no error before as always n_quads > n_hexes. 2/ Two doc fixes. 3/ Use of GeometryInfo::child_cell_on_face instead of searching through all children and faces.


git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@13113 0785d39b-7218-0410-832d-ea1e28bc413d

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