Fix sign in lower level maximization QP

[joaquimg]

Close #182 Replace #179

• [ ] Needs tests

[codecov[bot]]

Codecov Report

Base: 86.81% // Head: 86.81% // No change to project coverage :thumbsup:

Coverage data is based on head (0077fea) compared to base (2d25399). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #186 +/- ## ======================================= Coverage 86.81% 86.81% ======================================= Files 11 11 Lines 1714 1714 ======================================= Hits 1488 1488 Misses 226 226 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joaquim+Dias+Garcia). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Joaquim+Dias+Garcia)

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[joaquimg]

any idea why docs keep failing? Dualization 0.5.5 is released for hours.

[joaquimg]

docs failed, but after some time worked again, probably a delay in General registry update

[joaquimg]

replaced by #188