When an invitation incidence is being updated only, do not delete-then-add the incidence to the calendar; instead, use and AssignmentVisitor to  simply assign the update.  This is better because the user is not prompted with a Resource Selector dialog with a simple assignment.
When an invitation incidence is being updated only, do not delete-then-add
the incidence to the calendar; instead, use and AssignmentVisitor to 
simply assign the update.  This is better because the user is not
prompted with a Resource Selector dialog with a simple assignment.

and when the user is not prompted they are not allowed to move
the incidence to a different calendar resource -- which can lead
to sorts of trouble.

kolab/issue3776


svn path=/branches/kdepim/enterprise/kdepim/; revision=1008129

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