[SCIP] SCIP Optimization Suite 9.1.0

[Stefan Vigerske]

Hi,

version 9.1.0 of the suite has been released, which brings
- GCG 3.6.2 (bugfix release)
   https://github.com/scipopt/gcg/blob/v36-bugfix/CHANGELOG
- PaPILO 2.3.0 (minor release)
   https://github.com/scipopt/papilo/releases/tag/v2.3.0
- SCIP 9.1.0
   https://scipopt.org/doc-9.1.0/html/RN9.php
- SoPlex 7.1.0 (minor release)
   https://soplex.zib.de/doc-7.1.0/html/CHANGELOG.php
- ug 1.0.0 beta 5 (bugfix release)
- ZIMPL 3.6.1 (minor release)

Changes are bugfixes, improvements to stability, and minor feature 
additions. Some of these lead to minor API changes (usually 
backward-compatible).
Note that SCIP's enum SCIP_STATUS gained the additional values 
SCIP_STATUS_PRIMALLIMIT and SCIP_STATUS_DUALLIMIT, which may come up 
when setting options limits/primal (aka. limits/objectivestop), and 
limits/dual, respectively.
Further, the default for graph automorphism detection in SCIP changed 
from sassy+bliss to sassy+nauty.

Enjoy,
Stefan