Alpha Release 0.0.6

Release 0.0.6 primarily updates the qmake configuration file ddcui.pro. These updates address the situation that libddcutil related files installed by the ddcutil command sudo make install are put in local directories, e.g. /usr/local/lib instead of /usr/lib. Depending on Linux distribution, these directories may or may not be in the requisite search path. For an extended discussion, see Shared Library Configuration on www.ddcutil.com.