The progressbar was looping forever when someone sent us an invalid time result

If we dont specify the encoding, the system default is used which leads to encoding/decoding errors, depending on what the actual system default encoding is.

When hiding the Window the app is removed from the Ubuntu Launcher and it cannot be restored

Fixes automatic scrolling for the XMLConsole in GTK3

Type basestring doesnt exist in python3 anymore

Use -s or --separate to use the new complete profile separation or omit this switch to retain the old behaviour.

Added new gui extension point 'print_real_text' which is executed before the message line is printed

Added ability to read additional_data from history db and use it in gui extension point print_special_text.
I also found an iterator reuse in common/logger.py, maybe this fixes bug #8277

Corrected last commit and added ability to set and log additional_data for outgoing messages as well (and for gc messages, too)

Also added new property 'additional_data' to message event objects. Changes to this attribute (a dict) are passed on from event to event and are also written to the history db as json string (reading of those values isn't implemented yet).

Accidentally went with camel case here on the filename. Won't fail under windows, but will under *nix