Pyproximal

* Added ``pyproximal.optimization.primal.ADMML2``,
`pyproximal.optimization.primal.HQS`,
and ``pyproximal.optimization.pnp.PlugAndPlay`` solvers
* Added ``pyproximal.proximal.ETP``, ``pyproximal.proximal.Geman``,
``pyproximal.proximal.L0`, ``pyproximal.proximal.Log``,
``pyproximal.proximal.QuadraticEnvelopeCard``, ``pyproximal.proximal.SCAD``
operators.
* Allow ``tau`` parameter of proximal operators to be a vector to handle problems with
multiple right-hand sides.

* Added ``pyproximal.optimization.palm.PALM`` optimizer
* Added ``callback`` to ``pyproximal.optimization.proximal.ProximalPoint``
optimizer
* Added ``pyproximal.utils.bilinear.BilinearOperator`` and
``pyproximal.utils.bilinear.LowRankFactorizedMatrix`` operators

* Added ``pyproximal.proximal.L0Ball``, ``pyproximal.proximal.L1Ball``,
``pyproximal.proximal.L21_plus_L1``, ``pyproximal.proximal.Nuclear``,
``pyproximal.proximal.NuclearBall``, and ``pyproximal.proximal.Nonlinear``
operators
* Added ``pyproximal.optimization.primal.TwIST`` solver
* Added `acceleration` in
``pyproximal.optimization.primal.AcceleratedProximalGradient`` solver
* Added classes standard deviation in
``pyproximal.optimization.segmentation.Segment`` solver
* Added `chain` method ``pyproximal.ProxOperator``
* Fix ``pyproximal.proximal.Orthogonal`` by introducing `alpha`
in the proximal evaluation

* Added ``pyproximal.optimization.sr3.SR3`` solver
* Added ``pyproximal.projection.AffineSetProj`` and
``pyproximal.AffineSet`` operators
* Fixed ``pyproximal.Huber`` operator

* First official release.