ENH: orthogonal procrustes solver
MAINT: replace asarray with more specific format request
MAINT: tweak import
TST: more extensive procrustes testing
MAINT: fiddle with procrustes arrays
MAINT: add an optional return value to orthogonal procrustes and add a few more tests
DOC: add Raises to orthogonal_procrustes docstring
MAINT: remove unnecessary keyword argument from orthogonal_procrustes
Merge pull request #3809 from argriffing/linalg-orthogonal-procrustes

ENH: orthogonal procrustes solver