vtl: remove inadvertently committed CURLERRORDEBUG
possible fix for #5441 -- ardour hangs on shutdown (trying to stop harvid/xjadeo)
enable videotimeline by default
Merge branch 'master' into cairocanvas

Conflicts:
	gtk2_ardour/editor.h
	gtk2_ardour/editor_canvas.cc
	gtk2_ardour/wscript