The idea is to make hoods `work'.  So far, I've made changes so that when
wearing a hooded cloak

1) You cannot (W)ear or (T)ake off a helmet.

2) Thieves (eg nymphs) and foocubi can't remove your helmet.

3) Scrolls of destroy/enchant armour will not affect your helmet.

4) Fire/rust/acid traps/attacks won't erode your helmet.


TODO:

* The hood doesn't yet offer any protection against mind flayers' drain
intelligence attack.

* It would make more sense for the hood to be mobile - by (a)pplying the cloak,
the hood should be alternated between up and down.  This might cause problems
with save files, though.

* It might be interesting to have the dwarvish cloak and its `hooded cloak'
description included in the list of cloaks that are shuffled.  This way, it
would pe possible for one of the more useful cloaks to have a hood, in the
same way that particular types of boots are more useful if their description
is `snow boots'.  Again, this would mean complications in save files.