Some minor changes.

Suppressed duplicated lines, extra-lines, println and
disabled the context menu in the webview (until we haven't our own).
Merge branch 'master' of https://github.com/dahuapp/Dahu
Replaced F8 by F7 for taking a screen capture.

F8 is already a shortcut on MacOSX, so we replaced it by F7 for
taking screenshots.