Minor code cleanups suggested by NetBSD lint:

 - some commas at the end of enum declarations removed.
 - some unused statements and variables removed
 - some more careful typing of query expressions in index.c.
   (Writing 'condition ? (ptrtype *)stuff : NULL' doesn't give the
   overall expression type 'ptrtype *'; it's better to put the cast
   outside the ?:.)

git-svn-id: svn://svn.tartarus.org/sgt/agedu@8928 cda61777-01e9-0310-a592-d414129be87e