Weeping angel overhaul:

Weeping angels do not appear in Sheol.
Weeping archangels -- faster, stronger weeping angels -- appear only in Sheol.
Weeping (arch)angel damage distribution has been adjusted.
Weeping (arch)angels cannot move if the player can see them, although they can still use their melee and gaze attacks.
Weeping (arch)angels using their gaze attack on each other are turned to stone.

git-svn-id: https://unnethack.svn.sourceforge.net/svnroot/unnethack/trunk@1442 f1e491ac-5ded-4967-80bf-9f4855be876a