many changes
many changes

added doc tests to Copy
compress now returns a copy instead of doing the changes inplace
removed square; use __abs__
__mul__ doccumented the lack of asociative and distributive properties
property

sukisuki/mvn,MarkDaoust/mvn,sukisuki/mvn,sukisuki/mvn,MarkDaoust/mvn,MarkDaoust/mvn