Don't equip Spriggans with knives since they don't need a butchering

tool, and make pure casters not wield said knife (they're unarmed instead). Hunters now start wielding their sling/bow/crossbow. Hunters starting without a launcher will still be wielding their dagger. Update the tutorial accordingly, i.e. you might not have to switch weapons now to fire your bow.

Also, unrestrict Centaur Paladins.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6455 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 8, 2008
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