fix dump parser REs to handle some crazy table non-syntax

Parser choked on the nlwiki article "Nikkel", because the table
detection was trying to be too smart. Now removes some broken table
syntax as well.
handle [[target#section]] links
WIP SQLite database
readme, slightly smarter tokenizer
use re.UNICODE in wiki dump parser

Otherwise, \w won't match ß, ü, &c.