Updated scala-test
AbsDiff depends on new GuavaRange
Typo in IntervalSet
Revert "Interval was moved to CSPOM"

This reverts commit 57c4af1c597f7ebebfa3b5bcacfc2db2acb6cb1c.

Conflicts:
	src/main/scala/concrete/IntDomain.scala
	src/main/scala/concrete/generator/ProblemGenerator.scala
	src/main/scala/concrete/generator/cspompatterns/AbsDiff.scala
	src/main/scala/concrete/util/IntervalSet.scala