Detect singular jacobian for invalid start values #455
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This adds a special return code if the path tracker refuses to start due to a singular Jacobian. Hopefully, this helps to detect cases as in #454 faster.
I also added helper functions
jacobian(F::System)andjacobian(F::System, x, p = nothing)to compute more easily the Jacobian of a system resp. to evaluate it at a given point.