ADV Beta Version 9

Server/Client
- Server: try opening the TCP socket a certain number of
  times (two options were added to configure this
  behaviour: socket-period and socket-tries)
- Now mods can tag messages with the "tag" field to tell
  the client to replace older lines
- Show current server and default server on /servers
- Show number of currently connected players at login
- Add '/help topics'
- Add climate mod
- Other minor fixes and improvements

Mods
- Stats
- Attribute estimation and modifiers
- Flags
- Boundaries
- Read database options from properties
- Other fixes and improvements
- Climate starting point; sun height calculation