This update, despite ostensibly being a minor version, includes breaking
changes that must be accounted for.
Overflow is much more strictly checked, so the magnitude of certain
constants has been decreased.
CP-SAT's default number of workers has been changed to reflect the
default of this script. As such, the script no longer needs to change
that parameter unless a specific number of workers has been specified.
In light of the breaking changes, the OR-Tools version is now pinned at
9.1 instead of being permitted to use future minor versions.
Jeremy Saklad
110f524f62
