Improved Exception Hierarchy

After my discussions with mostly Camillo this afternoon, I added a working document regarding the Improved Exception Hierarchy:

        http://code.google.com/p/pharo/wiki/ImprovedExceptionHierarchy

So far, we started with:

        http://code.google.com/p/pharo/issues/detail?id=4029

It will be a very long road ...

Sven