In arena mode, make mons_friendly() and mons_wont_attack() always return false,

with mons_friendly_real() and monst_wont_attack_real() having the old behaviour of ignoring arena mode. Remove all special casing of "mons_friendly(mon) && !crawl_state.arena", instead using mons_friendly_real() and mons_wont_attack_real() in the monster code which distinguishes friend from foe. Might be a bit buggy.

Make Zot traps affect all monsters in arena mode, and never the player.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8255 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 5, 2009
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