Get valgrind reporting that all memory is properly freed at game exit

[morth]

Why do this? I can't see any other result than slowing down the game exit and potentially introducing bugs. Pure leaks is one thing, but reachable at exit is seldom useful to go after.

[takkaria]

It's mostly useful so we know that the game is actually watertight when it comes to trying to allow loading savefiles after death without restarting.

[anonymous]

Replying to takkaria:

It's mostly useful so we know that the game is actually watertight when it comes to trying to allow loading savefiles after death without restarting.

Also the borg will appreciate this.