global cleanup/fixup...

- use better language
- remove signs on break
- Use Essentials to show /seen information (rightclick on sign)
- new command: inactivelots	[lotmanager.inactivelots]
- new command: allocatelot	[lotmanager.allocatelot]
- new permission: lotmanager.sign.create
- fix /haslot: fix crash if player is offline
- fix /clearlot: also delete members of a region