In the wizard "Post Journal Entries", we can now select multiple journals and multiple periods.
Adapt error message accordingly.
Fix a typo in an error message.
Rename fields '_id' to '_ids', to reflect the change from many2one to many2many
Adapt the YAML test (but it still fails, I don't know why)
[FIX] I should wake up !
[MERGE] merge with addons/trunk revno 8956
[MERGE] improvements of 'post entry' wizard in order to allow the selection of several journals and several periods. Courtesy of Alexis de Lattre (Akretion)