CMakeLists.txt: * Used GTK3+ by default if available (the port is almost ready and it should compiles fine but don't hesitate to report any bug(s) there: http://www.glx-dock.org/bg_topic.php?t=5745) * Used GNU standard installation directories: http://www.gnu.org/prep/standards/html_node/Directory-Variables.html src/gldi: added this define: GLDI_BIN_DIR