this fixes error when accessing to special views on Transition objects
it also remove duplication of guard properties (they were stored in the
properties of the guarded object *and* in a guard object)

portal type Variable was renamed to Workflow Variable

remove InteractionWorkflow property sheet

+ improve TALES on transition guard role list

setting state category on workflow was overriding other catogories
(in particular the before/after script newly created)

and before_script_id to before_script

Too many method_id were changed to use getTriggerMethodId
It should not be used on activities...

they were originally named before_script and after_script and some
old names remained

+ rename field my_destination_title to my_destination to avoid using magic

missing "my_"