Add special public trial edit form, which allows editing the public trial information in a closed state.
Show public trial edit link if dossier is closed and the user has modify portal content permission in a open dossier state.
Hide public_trial and public_trial_statement in dossier and repositoryfolder.
Move find_parent_dossier method from opengerver.mail into opengever.base.utils.
Merge pull request #380 from 4teamwork/mle-public_trial_edit_public_trial_state

Allow public trial state to also be modified in closed dossier states