Made some funky smart pointer things for chunks.
Fixed a bug where the client would override the player position on the server and back again, resulting in sending too many chunks to the client which it doesn't even need.
Fixed some compiler warnings in cPickup.cpp
git-svn-id: http://mc-server.googlecode.com/svn/trunk@164 0a769ca7-a7f5-676a-18bf-c427514a06d6
