Display "loading data" in empty kiosk mode viewer

The have no file menu in this mode and the default message confuses.
At the same time in kiosk mode there is probably a preconfigured
image that just hasn't loaded yet.
Merge branch 'kiok_load_msg' of https://github.com/hanke/Papaya into hanke-kiok_load_msg
removed load message when in kiosk mode
fixed test
fixed test
display improvements