Notes:
This release adds most of the remaining set constraints. It also makes
backward-compatibility breaking changes to the way that properties of variables
are accessed.
Changes:
* Added channel constraints involving set variables.
* Added set min and max constraints.
* Added set sum constraints (optionally weighted or substituted).
* Added include (match) constraint for sets.
* Added distinct constraints (distinct and at most one) for sets.
* Added branch and bound search (optimization search). It's quite shaky at the moment though.
* Assigned values of variables are now always accessed using #value instread of the various previous methods. The methods for extracting information from set variables have been changed and renamed.
* Enumerations containing variables now provide a convenience method #values which returns an array of the enum's values.
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