Change "About Application" to "About Otter" and set proper icon, fixes #315
"Manage Search Engines..." improvements, fixes #313
Elide long bookmarks titles, fixes #296
Set INCLUDEPATH, fixes #278
Use INSTALL_PATH, set at compile time, fixes #316
Include QM files in repository, references #316
Add system authentication for proxy
Merge remote-tracking branch 'upstream/master'