fixed json lookup

 - target bill numbers should be 4-digits long, zero padded
 - perl script to convert the csv into a reverse lookup
script to rewrite json files to embed links

 - list of updated files included
TODO: some links won't be found

 - @konklone has the proper solution: fix it in the front end,
   find references in any section, not just the credits, and higlight
   why we can't link to parsable cites
dc code, rewritten with links to lims embedded

 - see @konklone's fix; it's better