RATIONALE
Improve usage of composer in comment or email mode: support batch-posting in
comment, support more configuration from templates, improve global model.
SPECIFICATIONS
Update report_template field on template model to be a many2many field instead
of a many2one. It allows to attach multiple dynamic reports to a given template
instead of being limited to a single one.
Name should now come from the report itself, which should be considered as
complete by itself. Template cannot override report naming anymore.
Task-2868153 (Mail: Allow multi reports in mail templates)
Part-of: odoo/odoo#99482
Thibault Delavallée
28b4ba4049