version 0.2: * Added the functions Data.SignedMultiset.isPositive and Data.SignedMultiset.isNegative, which return whether all elements in a signed multiset have respectively nonnegative or nonpositive multiplicity. * Added the functions Data.SignedMultiset.shadow, Data.SignedMultiset.modulus, Data.SignedMultiset.signum, and Data.SignedMultiset.unitstep which return respecitively the additive inverse, modulus, signum, and left-continuous unit step of a signed multiset. * Added the functions Data.SignedMultiset.filter, Data.SignedMultiset.partition, and Data.SignedMultiset.split for filtering and partitioning signed multisets. * Added the functions Data.SignedMultiset.foldr' and Data.SignedMultiset.foldl', which are strict versions of Data.SignedMultiset.foldr and Data.SignedMultiset.foldl. * Changed the behaviour of both the function Data.SignedMultiset.fromList and the Read instance of Data.SignedMultiset: it multiple element/multiplicity pairs are provided for the same element, the multiplicity of the element in the constructed multiset is now taken to be the sum of the provided multiplicities (rather than the rightmost multiplicity). * Added the functions Data.SignedMultiset.toLists and Data.SignedMultiset.fromLists, which convert between signed multisets and pairs of lists of elements with positive and negative multiplicity. * Made the dependency on the base and containers packages more restrictive. The dependency for base now carries the version constraint == 4.5.*, while the dependency for containers now comes with the constraint >= 0.4.2 && < 0.5. version 0.1: * Initial release.