[CM] sequence objects feature requests

[Lieven Moors]

I was wondering if it would be a good idea to add a :versioning and :version 
slot to the seq object.This would allow saving lots of sequence objects with 
the save-object method whithout specifyinga new name every time.Another thing I 
thought might be handy, is having an :end slot for the sequence object. This 
would make sequencing with sequences easier. It can be computed from the 
elements it contains.Correct me if these are silly suggestions...regardslieven