anchor.diff:  
   [install] Installation and upgrade files and DB schema
   
  -[js] core required javascript
  -
   [library] Third party modules (must be license compatible)
   
   [mod] Controller modules based on URL pathname (e.g. #^[url=http://sitename/foo]http://sitename/foo[/url] loads mod/foo.php)
  -
  -[spec] protocol specifications
   
   [util] translation tools, main English string database and other miscellaneous utilities
   
  
positive.code:     [li]app - peronal app data[/li]
      [li]attach - file attachments[/li]
      [li]auth_codes - OAuth usage[/li]
      [li]cache - TBD[/li]
      [li]challenge - old DFRN structure, may re-use or may deprecate[/li]
      [li]channel - replaces Friendica 'user'[/li]
      [li]chat - chat room content[/li]
      [li]chatpresence - channel presence information for chat[/li]
  
negative.code:     [li]group_member - privacy groups[/li]
      [li]hook - plugin hook registry[/li]
      [li]hubloc - Red location storage, ties a location to an xchan[/li]
      [li]item - posts[/li]
      [li]item_id - other identifiers on other services for posts[/li]
      [li]likes - likes of 'things'[/li]
  