Dev Diary 21/10/2018

• fiddled around with the spec, creating headings for concepts I want to link to
• cleaned up the legacy-data code
  • up to the point where I'm starting to be happy with the codebase
• sorted the legacy value test data by error category
• published a repo that lets you test the rust legacy test data implementation against the test data set: https://github.com/ssbrs/test-legacy-message-data