Internalised the use of an identity space when registering.
Cleaned up the interface and removed legacy ITK based registration.
Added ability to pre-crop images.
Fixed default to do first pyramid level only as this often gives good results and is fast.
Internalised the use of an identity space when registering. Cleaned up the interface and removed legacy ITK based registration. Added ability to pre-crop images. Fixed default to do first pyramid level only as this often gives good results and is fast.