Wrote a little add() function to clean up the duplication of
add_document().
Delete the index directory if it exists and we're being forced to
recreate it.
English fuzzy matches are preferred, followed by Roomaji and then
everything else.
The return tuple from lookup() now has a `name` parameter for the actual
name that was matched.
The setup command loads the default data into a default location, then
creates a whoosh index in a default location.
get_index is now open_index and can be made to explicitly recreate the
index. It also actually opens the index if it already existed, even
across processes, now that FileStorage is working.
The lookup command takes no switches for aiming at a different database;
it only uses the default data stores.
Whoosh's spelling module unfortunately ignores any "words" that don't
look like words, even though the algorithm words fine with arbitrary
input.
I had to clone some code from whoosh.spelling, but avoiding the
isalpha() check solved a bunch of problems. Now the index happily
compares against anything I feed into it.
