Problems when using the transforms bindings with reweighting

[bensarthou]

In the Condat-Vu reconstruction algorithm (for example in the reconstruct plugin), the options of reweighting "primal" and "dual" lead to some errors:

• With "primal", it calls a method not defined in gradient method and crashes.

• With "dual", if you use the wrapper to call the transforms, in some specific cases (transforms with nb_bands > 1), it applies wrongly the linear operator and the result of the reconstruction is deteriorated.

I haven't find a fix yet, as reweighting is out of my understanding.
For now, Sylvain has removed it in his PR factory, as it isn't used by anyone.

[chaithyagr]

Also noting other issues here:

1. The "dual" reweighting uses linear_op.transform object to obtain reweighting factor for each band, this is not scalable for all cases, especially for undecimated wavelet which I implemented for issue #4 .
2. Both reweightings are incompatible for multichannel cases. Both would ideally have different reweighting per channel per band.

I am getting these fixes with a PR