FR 1836617: Add item brand for plants (and mimics) in Tiles.

FR 1870291: Give a message when gaining exp for killing monsters outside LOS. (This is something the player can find out by checking their xp pool, anyway, so it's not like it gives anything away. Currently does not happen for pet kills, should it?)

Implement 1829910: Make Daevas fully resist negative energy, with the reasoning that TSO will protect them.

Also, fix dragon slaying to actually have an effect on draconian players (whoops!) as well as on characters in Dragon Form.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3282 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on January 16, 2008
23I5KJ245D43B6QYWS4TDQYJO2W2PKTDCLFBWPVAFDWS6L7NMGKQC
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