Feelings at status

Improve displaying of feeling status for players by showing LF:M-O at the status line.

M being a number from 1 to 9 indicating danger feeling of the level.
O being a number from 1 to 9 indicating value of treasure of the level. Or $ for special feeling or ? for you need to explore more.

This patch is discussed at http://angband.oook.cz/forum/showthread.php?t=6925

Help file dungeon.txt has been updated with a description of level and object feelings.