[ArchEc] restructure plind

[Thomas Krichel]

  Sorry for the noise from Woodside NY.

  After a most inspiring conversation with JMBC today, I decided to
  make paper handles (papids) the keys in plind JSON. I add the
  relative file as a field 'F' is the data for each payload. Yes, that
  duplicates that value, because all plods of a particular papid are
  in the same relfi ... but ok. It's impure but it seems to work.
  
-- 

  Cheers,

  Thomas Krichel                  http://openlib.org/home/krichel
                                              skype:thomaskrichel