[crossfire] "identification" skills patch

[Nicolas Weeger]

Hello.

http://sourceforge.net/support/tracker.php?aid=1638868 is a patch that makes 
the various identifying skills (smithing, alchemy, ...) work on a zone 
instead of a single spot under the player.
I think that's a fun one, what do you think?
(apparently it doesn't take into account los, so that should probably be fixed 
before committing)

Nicolas
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