Made item_def::base_type into object_class_type, instead of unsigned char.

Flushed out a few bugs as a result, specifically:

  1. Some monsters (e.g., orcs) can now get blowguns as they were intended to (look at the makeitem.cc change);
  2. Acquirement will no longer attempt to give you the books of minor magic if you've found them (look at the effects.cc change.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1374 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on April 26, 2007
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