[CM] beta2 available

[Heinrich Taube]

a new beta of cm 3.9.0 is available. besides bug fixes the main change is that open midi devices appear in the top level audio menu and there is a new "midi driver" dialog (Command-M)  to replace the menu items under the old static "midi out" and "midi in" submenus.

mac:
	http://camil.music.illinois.edu/software/grace/Grace-3.9.0-beta2-osx.zip
win:
	http://camil.music.illinois.edu/software/grace/Grace-3.9.0-beta2-win32.zip
src:
	http://camil.music.illinois.edu/software/grace/Grace-3.9.0-beta2-src.zip