[plt-scheme] 370.6

[Matthew Flatt]

One more in 370.6:

 * Added `map-command-as-meta', which affects the keybinding% mapping:

   When set to #t, "m:" refers to the Command key under Mac OS X (in
   addition to the Meta key under X11 and the Alt key under Windows).

   When set to #f, "m:" has no corresponding key under Mac OS X (which
   is the old/default setting).

The idea is that a "Treat Command as Meta" option in DrScheme will
replace the current "Treat option key as meta" option (which doesn't
work at all).

Matthew