Rel. to issue 262: Transposed the s-vectors of decompositions in cutIntroduction and changed their type from List[List[FOLTerm]] to Set[List[FOLTerm]].

git-svn-id: http://gapt.googlecode.com/svn/trunk/source@1928 85d21ef8-add0-11de-ae77-5bfb9c5a3f34