Version 0.5.5 released

This release has
* user login - all users see same view at this time; default admin passwd is set at install time
* a unified display code for frames and non-frames view,
* user preferences, including the display of feedicons and their display size, the choice of frames or non-frames on individual login
* digg icon for Digg articles (will be moved to plugin later)
* Firefox 2 integration
* lots of code cleanup