Restore support for SIGUSR1 and SIGUSR2

SIGUSR1 to update the files (action update_files)
SIGUSR2 to display Run Netlister and Simulator window (action run_netnsim)

It seems the signal is processed when application get the focus
Set Application name

This restore DBus support through IOscopyApp at path "org/gtk/oscopy".
All Appmenu action are available