lispdoc - results for update-release-differences

(ql-dist:update-release-differences old-dist new-dist)
Function: Compare OLD-DIST to NEW-DIST and return three lists as multiple values: new releases (present in NEW-DIST but not OLD-DIST), changed releases (present in both dists but different in some way), and removed releases (present in OLD-DIST but not NEW-DIST). The list of changed releases is a list of two-element lists, with each two-element list having first the old release object and then the new release object.