Add a new way to register called linear integration registration

[JeanBilheux]

The user will define the position of a marker on a first image, then the same marker on another image and all the image between will be linearly registered.

[JeanBilheux]

This new way should be part of the marker UI. We will need to provide the option to select a first fix marker, a last marker and then position all the other markers between them by interpolation.