Fix uninitialized string in Cmd_Alias_f.
Add some tests around Z_CopyString, as valgrind was complaining about it. Turns out, it's Glib's slice allocator that pisses valgrind off.
Simplify VBO binding cleanup.
Condense a line.
Valgrind suppressions for OS X Lion / NVidia 330m (Macbook Pro late 2011).
Move Con_Shutdown before Cmd_Shutdown. Con_Shutdown attempts to remove commands.