Release 5.6.0

[Joao-Dionisio]

fix #971
fix #1050
fix #1018

Just leaving this here for the release we'll probably do next week or the one after. It's going to use SCIP with the following hash: scip@747acc1e
This commit in particular splits stage checks from debug mode, and will be enabled by default on PySCIPOpt. Performance degradation is minimal, and it solves a bunch of user-issues. We'll also add the option to remove these stage checks, for the small performance gain.

Plus, the plan is to also start shipping PySCIPOpt with PaPILO and try to make it compatible with Linux ARM.

[mmghannam]

This is outdated, right? @Joao-Dionisio

[Joao-Dionisio]

@mmghannam Yes, but this comment is important:

This commit in particular splits stage checks from debug mode, and will be enabled by default on PySCIPOpt. Performance degradation is minimal, and it solves a bunch of user-issues. We'll also add the option to remove these stage checks, for the small performance gain.

We need to alter setup.py slightly, and add a line to the installation instructions. The relevant Gitlab issue: https://git.zib.de/integer/scip/-/merge_requests/3938