Scheduling with optional tasks - #521
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…cpsp utils to work with this new problem
…_alternative) using this feature
…sing function updates in unittest
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We add the possibility to -not- accomplish task, based on either feasibility or by additional constraints.
To test the concept, we create a new feature called AlternativeSubproblem :
it gives in a form of a graph or list of possible tasks paths, some possible task to execute (and the other no).
We add an implementation of rcpsp_alternative, where some part of tasks are subject to "alternativesubproblem" constraint, which means there is a choice between different sequence of task to accomplish.