Log Message:
Update to 0.1.6.

Changes:
 + Add Delete All to transferbar
 + Show search in context menu
 + Implement 'Default' search engine
 + Show only icons in Statusbar Features
 + Implement Clear private data
 + Support News Feed icon and external aggregator
 + Fix reloading of Not found pages
 + Fixup spaces when middle click opening
 + Fix possibly wrong identificaton string
 + Optionally search engines in completion
 + Optionally Gtk 2.16 entry progress and icon
 + Experimental panel detaching
 + Support external download manager again
 + Implement '-a', '--app' argument
 + Implement '-c', '--config' argument
 + Fix a bookmark saving issue
 + Support data: URIs in the address entry
 + Several performance and memory leak fixes
 + Load cookies idle to accelerate startup
 + Support mailto: links
 + Save tab reordering in the session
 + Add a Cookie Manager extension
 + Fix crashers in Colourful Tabs