avoid name-conflict

when compiled with -rdynamic, "AudioStream" symbol
conflicts with AspectVST.so
NOOP clean up code

move curl-http-get wrapper-function which is used by various
videotimeline related code to util.c
remove cruft - old CMT imageframe*
remove old/unused export_multiplicator
remove cruft
don't display freewheeling & samplerate LV2 ports on GUI
packaging scripts: use rsync for video-tools
osx packaging: clean up temp dirs

OSX's .DS_Store file keeps rmdir from working.
Merge branch 'master' into cairocanvas

Conflicts:
	gtk2_ardour/editor_canvas.cc
	gtk2_ardour/imageframe_time_axis.cc
	gtk2_ardour/imageframe_time_axis.h
	gtk2_ardour/imageframe_time_axis_group.cc
	gtk2_ardour/imageframe_time_axis_group.h
	gtk2_ardour/imageframe_time_axis_view.cc
	gtk2_ardour/imageframe_time_axis_view.h
	gtk2_ardour/imageframe_view.cc
	gtk2_ardour/imageframe_view.h
	gtk2_ardour/marker_time_axis.cc
	gtk2_ardour/marker_time_axis.h
	gtk2_ardour/marker_time_axis_view.cc
	gtk2_ardour/marker_time_axis_view.h
	gtk2_ardour/marker_view.cc
	gtk2_ardour/marker_view.h
	gtk2_ardour/video_image_frame.cc
	gtk2_ardour/visual_time_axis.cc
	gtk2_ardour/visual_time_axis.h
	libs/canvas/canvas/circle.h