add addMainScreenButton to allow other screens to attach buttons to mainscreen
catch UnicodeEncodeError
display disk images
add event for notifying mainscreen of server-side slice changes
call deleteslivers when last sliver deleted
handle clicking in the main window when no rspec downloaded
fix NONE displayed for protogeni boot state
support for hardware_type
make sure default slice tags are sorted above all other lines
remove obsolete code
attribute stuff working
fix support for new get_default_sliver_attributes returning dicts
fix bug when slice has default attributes
changes for latest sfa
extract out the client-slicemgr code from mainscreen
add sliver_type column, sorting in mainscreen
deleteslivers for the emulab aggregate
changes to work with latest rspec versions, try create at aggregates for protogeni compatibility, add mechanisms for getting version info from sfi into sface
show error messages when refreshing nodes
update view color-coding code