Changes

Major

implemented Solution.infeasible property that tries to understand whether the solver returned an infeasible status
implemented csnlp.util.math.norm_1 and norm_inf for easier conversion of these norms to linear programmes
converted Mpc.set_linear_dynamics to the more general set_affine_dynamics
added single and multiple shooting affine time-varying dynamics in PwaMpc, allowing users to specify a switching sequence and solving a simpler quadratic programme, instead of optimizing also over the sequence of regions

added solver_plugin property to Solution, so that one can retrieve the solver used to compute a solution to an optimization problem
fixed bug with optimization problems with a single scalar discrete variable
fixed bug in ScenarioMpc where single slack variables were not properly substituted
better docstrings
updated CI