Change request to signatures of Decreasing & Increasing constructors

[thomasleaute]

Please change the signature of the Decreasing constructor from

public Decreasing(List<IntVar> x)

to

public Decreasing(List<? extends IntVar> x)

This would make it possible to use the Decreasing constraint with variables that are expressed as subclasses of IntVar.

The same applies to the following constructors:

public Decreasing(List<IntVar> x, boolean strict)
public Increasing(List<IntVar> x)
public Increasing(List<IntVar> x, boolean strict)

[krzku]

Done! Will be available in next release.