- Add 'Help' button to user and group properties dialogs.
- Home dir permission configuration in Preferences dialog.
- Mailbox permission configuration in Preferences dialog.
- Mailbox group in Preferences dialog.
- Allow to edit GID in group properties.
- Allow to edit Group name in group properties.
- First available UID and GID in preferences dialog.
- Group quotas.
- Update last change field when changed
