NH4: Kills, genos, conducts from Ctrl-X screen

These are all selectable from Ctrl-X, which now shows a selectable menu.
"a - Intrisic abilities" is changed to "n - Intrinsics", the return
value of minimal_enlightenment() is no longer changed for no reason, and
doattributes() is simplified now that wizard/explore mode info can now
be chosen from the menu if you're in one of those modes.

Improve ^X to list what disclose does at the end of the game
Alex Smith <ais523@bham.ac.uk>
cd9df40a312add1baa289cbac7aac08eaf9369be
NH4: Fix erasing incorrect message line

Without this fix, lines that reached or exceeded the message window
width would cause the line after it to disappear.

Compared to NetHack4, --More-- and "You die" are also cleared when they
should be.

Fix erasing incorrect message line.
Jared Minch <jmminch@gmail.com>
c872d5639f8b04af2888fed526e9df934892d0a6