Add license/access of a work

[eroux]

I've added two fields in the work jsons:

• license that can have two values:
  • copyrighted
  • publicdomain
  • ccby (shouldn't happen)
  • mixed (shouldn't happen)
• access with the following values:
  • fairuse (shouldn't happen)
  • mixed (shouldn't happen)
  • restrictedinchina (shouldn't happen)
  • open
  • restrictedbyquality
  • restrictedbytbrc
  • restrictedsealed
  • restrictedtemporarily