Bukkit

When a player retrieve material, he can't return where material was. Datas are now correctly stored through player connections and server restarts. The movement limitation is less buggy and is centered.

Issues:

The first plugin loading display error message. Player get new material for each connection. And the block where he is standing become glowstone, without actually becoming is tree heart. If player break a block of his tree which allow him to be where he is, he can't move after and stay stucked.