ISubject: iterate over a copy of the observerlist
ISubject: iterate over a copy of the observerlist

This prevents corruption of the iterators when attach() or detach() is called
(indirectly) through one of our Observer::update() calls

svn path=/branches/kdepim/enterprise/kdepim/; revision=1029626

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi