Motion correction

[emiwar]

Idea: have motion correction as an interative step in the algorithm.

• [x] When loading a segment to the GPU, then shift it on the fly (seems to take ~0.8s for a 5gb segment so not so bad, and this can likely be substantially improved with more clever use of in-place operations since most of it was memory time).
• [x] For the actual MC step, then load the unshifted segment to GPU and for each frame shift it to match the reconstructed frame from the solution (A*C + background).
• [ ] The MC struct could also hold a background (static or rank-1) that doesn't shift. This could fix camera artifacts. During motion correction this background also needs to be updated.

[emiwar]

There should also be a part of the GUI that shows the motion correction.

[emiwar]

Added a second motion correction function that corrects within each video segment. It could be generalized to work across multiple segments.

[emiwar]

Backlog:

• [ ] Non-rigid (or piecewise rigid) motion correction
• [ ] Motion correction in the main loop

[emiwar]

• [ ] Support for saving and loading motion correction parameters.