Modify quiver to only quiver ammunition explicitly chosen by the player

(via (,) or i, or by the new quivering command). Ammo that just happens to come next in the fire order is not quivered anymore even if you continue firing. Add a new quiver command on Q, and while I was at it, restrict the items offered when firing (fi) or quivering to actual throwables. (This was a long outstanding FR.) I think that's it…

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6112 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on June 24, 2008
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