Implement callbacks for python solvers #361
Merged
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We add a callback hook for:
A callback is a function, called at each solver's iteration, taking the solver as argument and returning a boolean. If returning True, the solver stops.
We also make some intermediate results attributes from the solver to be accessible in the callback.
And add limited docstring so that the signature of solvers
__init__()
will show in the doc with the callback behaviour documented.