update install script: add milena repo to sources and install milena
added more icons and fixed icons in some apps.
refs #1141
install script refactoring, PEP8 changes, force shutdown of sound effects process if it hangs, deleted unused imports
Merge branch 'master' into film

Conflicts:
	install_pisak.sh
	pisak/res/icons/fullscreen.svg
	pisak/res/icons/ocena.svg
	pisak/res/icons/pauza.svg
	pisak/res/icons/play.svg
	pisak/res/icons/stop.svg