Cjg/quaddirect tweaks#78

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Cody-G wants to merge 3 commits intomasterfrom

cjg/quaddirect_tweaks

Commits on Feb 16, 2018

Allow user to supply an initial transform, use IdentityTransformations as defaults.
Cody-G
committed

Commits on Mar 27, 2018

Rework and improve QuadDIRECT registration. Now has options for translation, rigid, and full affine transforms.
Cody-G
committed

Commits on May 14, 2018

Expand translation limits for fine translations
Cody-G
committed