Make the dictionary term part of the path, rather than the query string

Per #184.
Move the dictionary term from the data array to the URL.

Per #184.
Optionally get ancestry data

Only get the law's structural data if the query requests that.
Sanitize the input data
Optionally pass the section number

Per #184
Overhaul how definitions are returned

Per #184, plus general improvements.
Whitespace
Explain this goofy query
Make scope optional in the SQL query

Per #184.
Return multiple definitions

Per #184.