Continuous relaxation meta problem

[jhasse]

I've created a meta problem for relaxing a (mixed-)integer problem. This will be useful when implementing a branch and bound algorithm.

[darioizzo]

The code looks good.

In doxygen and sphinx, a better explanation of what a continuous relaxation is should appear. A link to some online resource explaining mixed integer continuous relaxation (for example http://docs.mosek.com/7.0/capi/The_optimizers_for_mixed-integer_problem.html) should also be included.

[jhasse]

Thanks :) I've added the link and explained what the class does in one sentence.

[landscape-bot]

Repository health decreased by 0.04% when pulling a49ee79 on jhasse:relaxed into c26822a on esa:master.

• 5 new problems were found (including 3 errors and 2 code smells).
• No problems were fixed.