*** Changes in Version 1.0 ***

  0. NUMEROUS BUG FIXES

  1. Added feedback messages on operations: opening and reading agenda files,
     killing agenda apps, etc.
     
  2. Added a "cursor": a highlighted square that can move with arrow keys.
     The Enter key will open the Day View.
  
  3. Much better integration with Agenda: both can be open simultaneously and 
     the Agenda is only killed when necessary.
     
  4. Registration key is now implemented -- with some crazy encoding scheme.  

  5. Switched the meaning of the filter buttons.  Now pressing a button 
     will mean to include that category.

  6. Improved performance -- both the display rendering and the reading of 
     the files.
  