[Scip] using SCIPsetObjlimit with optimal value

[Stefan Lörwald]

Hi,

during the development of a heuristic, I thought having encountered a bug
as setting the optimal value as a bound via SCIPsetObjlimit(scip, value)
resulted in infeasibility. However the documentation of this method states
that the optimal value has to be better that the value provided, so the
behaviour wasn't wrong at all. What is the design decision behind this? Why
not allow for equality? What is the recommended design pattern for setting
a limit to the objective value gained by heuristic which might be optimal?
Adding a constant surely is non-optimal since it makes things a bit worse
in the case of non-optimal results of the heuristic.

Thanks in advance,
Stefan
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