[workflow] finish refactoring introduced by 021035b9a7ab for 'go back' transition:
* fix SubWorkflowTransition.destination() prototype (must now take an entity as argument)
* fix the change state for to give the entity to the transition's destination() method
* we need a new method to draw workflow since we've no entity to give and 'go back'
transition usually go back to multiple states
addressbook
basket
blog
book
calendar
comment
company
email
file
folder
i18ncontent
keyword
link
mailinglist
person
tag
timeseries
vcsfile