Added two command hints: 'v'iewing for certain features,

and how to turn autopickup/autoprayer on again after an encounter with an invisible creature.

I also modified selection of book shops, so the offered books are more likely to be different. This changes balance in that on the whole more books are present, so maybe we should simply throw duplicates out rather than reroll. Oh, and manuals are now even rarer than before. Maybe they should be excepted from this new rule.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2056 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on September 4, 2007
QZERCVTY5BISIKSDH6WUXGZPIBAF4KUCGSZEEGMGBCORNUXT4HXAC
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