Ftw.notification.base

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- Show groups only if they have View permission
[mathias.leimgruber]

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- Make notification form available (URL)
[mathias.leimgruber]

- Do not show contact objects for notification (makes no sense).
Set membersonly = True for assignable_users vocab.
[mathias.leimgruber]

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- implemented CC notification
[mathias.leimgruber]

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- Fixed the translations, used i18ndude

- Select all recipients.
[vba, jone]

- Error when no recipients selected.
[vba]

- Sort recipients list.
[jin]