v9.5-rte3.0

This is the last Release before we bump to Ortools 9.8

Improvements on the usage of the library with Xpress

• it is now possible to suggest a feasible solution to Xpress by using the SetHint method
• improve usage of Xpress environment variables, we are now compliant with the standard Xpress installation
  • XPRESSDIR point to the path of the Xpress installation root-dir
  • XPAUTH_PATH is the path of the license file
• it is now possible for the user to define a call-back when XPRESS finds a new feasible integer solution (in MIP mode) and extract this solution
• improve Xpress performances by updating all objective coefficients in one time

Delivery

• add support for OracleLinux8

Code quality and CI

• disable fragile test for the sirius interface
• improve the GitHub Actions workflows
• add support for OracleLinux8
• improve Xpress interface code quality