Bukkit

A number of servers are now running on multiple worlds, both to support a variety of map types (eg. nether/normal) and to ease the transition between map generation algorithms between minecraft versions.

Some possible ways of doing this might include:
- Simple flag that turns per-world homes on or off. Unsure what behaviour should be if it is on, then turned off - should it require a new home to be created?
- Option to only allow homes in specified worlds. Eg. a server may split their worlds into happy fun land and hard-core survival.
- Allow the user to specify which world home they go to? I'm unsure about this, as this may be better satisfied by a warp plugin instead.

I see it's in the TODO, thought I'd formalise it in a ticket. I'm happy to try implementing a pull request if you don't have time, though it would be better to know what you'd want implemented.

Agree on this one.