ENH: Significantly speed up groupies registration test
ENH: Significantly speed up groupies registration test

Fewer number of iterations and larger grid spacing.

kaspermarstal/SimpleElastix,kaspermarstal/SimpleElastix,kaspermarstal/SimpleElastix,kaspermarstal/SimpleElastix,kaspermarstal/SimpleElastix,kaspermarstal/SimpleElastix,kaspermarstal/SimpleElastix