[1849483] Warn player when fire_items_start option is blocking selection of the only available missile (note that this doesn't entirely address the problem).

[1852034] Added greedy_items option to explore_stop to force greedy explore to stop and announce even items that it plans to pick up.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3137 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on December 28, 2007
WJSQFRBUSDKGMQLKIBDVXTWJQHIL45GVBAYXB43AG3NACXYE3BBQC
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