ENH: Progress reporting for antsAI

[cookpa]

Proof of concept for progress reporting in antsAI. Currently prints every iteration, which is potentially a lot - could be smarter and print progress at intervals.

Fixes #439

[cookpa]

Updated with some improvements. Outputs to terminal for every [(total iterations) / 10] iterations, and reports the best metric value at the end.

[ntustison]

Thanks for this @cookpa

[akvilonBrown]

Hello.
I'm trying to apply ANTS for pairwise registration. My objects are 3D NMR images of plant seeds, they can have different orientations, and I understood that antsRegistration is not supposed to work with drastic affine differences.
So I tried antsAI to produce a rough affine transformation, but it seems it doesn't work as expected.
I created a pair to test - the second object is rotated 60 deg on one of the 3D axes.
antsRegistration can manage to find a rigid transformation (for greater rotations - it doesn't find), but antsAI gives a weird transformation.
When I apply antsApplyTransforms, the rotation is wrong. (It is ok with matrix from antsRegistration when rotation is small.)
I don't know how to debug and what am I missing.
May I create an issue (I can share data and commands) or maybe you can suggest how to track the process in antsAI ?

[cookpa]

Yes please open an issue following the issue template, with a reproducible example (ie, something we can download and run without modification)

[akvilonBrown]

Thank you!
#1529