old 3D mesher: embedded points in volume

(1) improved stats for analyseCurvedMesh plugin. (2) add function that sample quality measures for testing

include closure points for the periodic counterparts in order to ensure finding the correct periodic copy, compatible with the periodicity at hand (in case of multiple periodicicities)

Detection of boundary triangles and quads of tetrahedral submeshes after creation of hexes and prisms.
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(1) add new 'isotropy' measure: equivalent to the old 'anisotropy' measure but easier to compute. (2) imporvements