Fabian Rost authored Nov 04, 2016 and Jörn Starruß committed Nov 06, 2016

typo: `qt4-dev-tool` -> `qt4-dev-tools`
package `xmlint` does not exist, command line tool `xmllint` is contained in `libxml2-utils`
added `libqtwebkit-dev`
Remove unneeded `libqtwebkit4`

add new one-liner for Ubuntu 16.04 LTS: `libqt4-webkit` -> `libqtwebkit4`