One-eyed Sam is black again; black marketeers are now yellow

git-svn-id: https://unnethack.svn.sourceforge.net/svnroot/unnethack/trunk@1512 f1e491ac-5ded-4967-80bf-9f4855be876a
Various minor changes from UnNetHackPlus:

Master Assassin has poison resistance.
It is no longer necessary to activate Elbereths.
Wishes do not increase prayer timeout.
Lichen dipping formally identifies potion of acid.

Also added YAFM for chatting with a gargoyle.

git-svn-id: https://unnethack.svn.sourceforge.net/svnroot/unnethack/trunk@1513 f1e491ac-5ded-4967-80bf-9f4855be876a
Source comment for reference.

git-svn-id: https://unnethack.svn.sourceforge.net/svnroot/unnethack/trunk@1514 f1e491ac-5ded-4967-80bf-9f4855be876a
Nazgul scream attack added, with limited range (from UnNetHackPlus, based on code from SporkHack).

git-svn-id: https://unnethack.svn.sourceforge.net/svnroot/unnethack/trunk@1515 f1e491ac-5ded-4967-80bf-9f4855be876a
All shopkeepers are yellow (with the exception of One-eyed Sam).

git-svn-id: https://unnethack.svn.sourceforge.net/svnroot/unnethack/trunk@1516 f1e491ac-5ded-4967-80bf-9f4855be876a
Weeping (arch)angels can occasionally plunge the player into darkness.

git-svn-id: https://unnethack.svn.sourceforge.net/svnroot/unnethack/trunk@1517 f1e491ac-5ded-4967-80bf-9f4855be876a
Decreased chances of weeping (arch)angels turning off the lights. Weeping archangels have a higher chance of doing so than regular weeping angels.

git-svn-id: https://unnethack.svn.sourceforge.net/svnroot/unnethack/trunk@1518 f1e491ac-5ded-4967-80bf-9f4855be876a