Indexer asian language fixes and speed-ups

Make Chinese and Japanese work better with the new indexer.
Some missing punctuation added to utf8_stripspecials.
Misc. other changes to make indexing faster. The indexes will expire on
backend upgrades, so you don't have to delete *.indexed

darcs-hash:20061117123032-6942e-774b38e08234928c49b37e40addba375acf67ac0.gz