agenda: don't authorized edition of patient for a periodic appointment
Fixes #2791
agenda/dossier: display on appointments when a participant is missing (fixes #2039).
agenda: display in column appointments.
agenda: go back on page break management.
agenda: soft protection to avoid billed appointment modification (fixes #2942).
dossiers: remove summary of agenda therapeture and trailing blank page.
agenda: display time before date on appointment form.
agenda: enlarge a column title.
agenda: act state can not be modified one ce the act is billed.
agenda: only show 'courrier' link if a rtf template dir is set.
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