Remove duplicated documentation from the OSHIP code

Actually, there are too much duplicated and unimportant documentation in the OSHIP. Here, duplicated code means Python same docstrings which appear both on classes and interfaces. Also there are incorrect uses of the zope.schema module for documentation. It is used to define documentation but also must be used to describe human interfaces. Classes which will never be a human interface uses that module and pollute themselves with unused behavior(on most of cases), even creating circular import problems. So, all classes must be fitted only with their own purposes.