Fix -2-or-lower-enchanted weapons instakilling everything

I'm going to claim this is what random(n) did in Turbo C.
Prove me wrong!
Sort of fix saves

But item loading is broken, as you will see if you save and reload
near an item. If you do it twice, it is even more broken.

This is still sort of useful as long as you're careful only to save
before you're about to go down stairs.
Merge pull request #6 from rwbarton/master

fix instadeath from -2 weapons, sort of fix saves