Common base class for LinearFunction and LinearConstraint

[jdemeyer]

In order to improve the handling of chained inequalities in MILP constraints, it makes sense to have one common base class for LinearFunction and LinearConstraint since that should be the level where the chaining is implemented.

CC: @mkoeppe

Component: numerical

Author: Jeroen Demeyer

Branch: 3782ec2

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/20478

[jdemeyer]

Branch: u/jdemeyer/common_base_class_for_linearfunction_and_linearconstraint

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

3782ec2

Common base class for LinearFunction and LinearConstraint

[sagetrac-git]

Commit: 3782ec2

[mkoeppe]

Reviewer: Matthias Köppe

[vbraun]

Changed branch from u/jdemeyer/common_base_class_for_linearfunction_and_linearconstraint to 3782ec2

[jdemeyer]

Changed commit from 3782ec2 to none

[jdemeyer]

Changed reviewer from Matthias Köppe to Matthias Koeppe