Code adjustments after revew
- align copyright statements in header and cpp files
- explain why gdbus as example used in README
- remove iostream dependency in favour of tqDebug in main.cpp
- add again xml header in notificationdaemon.xml
- remove dbug-glib check from ConfigureChecks.cmake
display icon instead of text if supplied
Make notification float up the screen
Signed-off-by: Emanoil Kotsev <deloptes@gmail.com>