primal-dual restart and support for outputing duals variables #45
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in the C++ interface
series of updates of the internals, around starting point procedure, to update and compute dual variables when user specifies them via 'get_starting_point'
was passing by value instead of by ref
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Two main capabilities are provided by this PR.
i. solution and iterate callbacks from hiopInterface returns duals multipliers
ii. primal-dual starting point can be now specified via hiopInterface
NLP MDS Example 4 has been updated with an example of a primal-dual warm/hot start.
This also addresses Issue #30