Fix one_slack_ssvm with hard (negativity) constraints#189
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I had issues with 1-slack ssvm with negativity constraints, see #188. I think the dual solved by cvxopt was incorrect.
Here I changed it into what I think is the correct dual, and added the possibility to have positivity constraints, as well as any hard constraint
<a_i, w> >= b_i.I did not change n_slack_ssvm which still might have problems.