In check_weapon_wieldable_size(), adjust fit a bit depending on size.

To compensate for this, make quarterstaves and lajatangs medium instead of large, and dire flails large instead of medium. This eliminates the need for special cases when small races wield quarterstaves, lajatangs, or bows, and also hopefully restores 0.4's behavior regarding wieldable weapons, fixing [2569070].

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8915 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on February 5, 2009
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