containers
   sizefolder - only holds N things, if try to add more, the oldest is deleted
   normfolder
   timefolder - only holds things for N seconds
   protocolfolder - filled with template entities
   sourcetemplate - a template for message sources
   sourceclone - a message source attached to a folder
   message

display
   linedisplay (IRC, talk, bnet) - simple one message per line, sorted by arrival
   icondisplay (Mail, icq, news) - nested folder thing
   sourcedisplay (All) - displays the message sources attached to this folder
   textdisplay (like IRCII, BitchX)

entities
   entity -- has an icon and an associated container
      trash -- trash can icon, sizefolder
      folder -- folder icon, normfolder
      template --