tags: mp3: write IDv2.4 tags only
menu: make current() return an iterator
menu: remove unused methods
remove filtering
window: fix wheel scrolling if NCURSES_MOUSE_VERSION > 1
media library: fix adding songs with fetch delay enabled
playlist editor: fix adding songs with fetch delay enabled
lyrics: check if the song exists
change version to 0.6.1
Merge branch '0.6.x'

Conflicts:
	NEWS
	configure.ac
	src/media_library.cpp
	src/playlist_editor.cpp
	src/tags.cpp