Linux: Debian package works (unlike AppImage), but no top-level menu unless reader view open

[danielweck]

This in itself is not a big deal, but what is more annoying is that the small "open publication" dialog does not have a "exit" option, so it requires CTRL-C to shutdown!!

1. Download r2-testapp-js_1.0.6-0_amd64.deb from https://github.com/readium/r2-testapp-js/releases/tag/latest-linux
2. sudo apt-get install ./r2-testapp-js_1.0.6-0_amd64.deb
3. r2-testapp-js

[danielweck]

Related issue: #17

[danielweck]

Same problem in Windows.

[danielweck]

Fixed by adding the missing top-level menu, and more importantly by adding a confirmation dialog to exit the app (same logic on MacOS, Linux and Windows to make things simple, although conventionally there is a different behaviour on MacOS because of the persistent window-less top-level menu ... but this is fine for a test app)
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