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the patch is applied to HEAD and maint-0-8.

dbm indexer needs a bit more work: if i change text_splitter
to use unicode in a way similar to indexer_rdbms, dbm
indexer fails in .save_index() because there are no slots
for russian letters.

Richard, could you update docs, please?  i think we should
mention that from now on the database and all templates
*must* be in utf-8; other character sets are not and will
never be supported.