History for UserSubscriptions

??changed:
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UserSubscriptions

  Flexible User and machine based subscriptions for push based
  updating. 

  Subscription Types

     - Category

     - Author

     - Package

     - Site

  Subscription Frequencies
   
     - Instant (as frequent as cron job, empties q).

     - Daily
 
     - Weekly

     - Monthly
 
  For machine based subscriptions, gideon exports rss files, to provide
  extra content it will probably be nesc. to do this with rss1.0 and
  an additional namespace. again the rule of open implementations should
  hold, consider for example XSA as subscription format.