* recently opened config file menu entry implemented, code related to scaling refactored, MainWindow and main() refactored to prevent window from closing when tunnel is running
0.2.1
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* scaling mechanism implemented (when run on Retina screen, scale will be increased)
0.2.0
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* api of corelib changed (start_application does not block anymore)
0.1.2
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* almost all functions/methods have docstrings, bug fixed in business_logic(): the user was not able to exit the program normally unless the user opened a configuration file
0.1.1
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* almost all functions/methods have docstrings, bug fixed in business_logic(): the user was not able to exit the program normally unless the user opened a configuration file
0.1.0
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* business logic refactored, improved signalling between GUI and business logic improved