No application indicator on Unity

[ahitrin]

In Unity, classic system tray is broken and unusable. This causes several problems in UX: inability to Encrypt/Decrypt account files, inability to close application.

We should look for fix/workaround for that. Unity uses 'appindicators' instead of classic icons, therefore we should try to implement appindicator support.

Some links on that:

• http://askubuntu.com/questions/42211/how-to-create-unity-indicators
• http://stackoverflow.com/questions/7853665/where-can-i-find-information-on-integrating-java-applications-into-the-ubuntu-ap (dbus, meh)
• http://cheesehead-techblog.blogspot.ru/2012/09/unity-application-indicators-using.html
• https://wiki.ubuntu.com/DesktopExperienceTeam/ApplicationIndicators

[ahitrin]

Alternative: implement window menu.

[arkaev]

Now we use menu for Unity desktop ( see d34f50cc3215734f2d7bb9ad0e0306a7e97ea7bf )