IDLE really needs a way to print.

It turns out that on Windows, you can print a text file
by invoking notepad /p filename. We can do that using
os.popen() (rather than os.system(), which opens an
ugly DOS box).

On Unix, we can invoke lpr filename in the same way.

So we can make this a standard menu item that takes the
command line to use from the configuration file.  I'll
implement this when I have time (or someone else can
implement it).

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According to Mark Hammond, you can also print by copying the
file to the default printer name; if you have win32all,
win32print.GetDefaultPrinter() returns the pathname for the
default printer (e.g. \\brat\canon).

Tim Peters notes that you can use "start /min notepad /p
filename" to avoid opening notepad's main window (it still
shows a dialog with a cancel button for a fraction of a
second).

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I've added a simple Print Window command that does this
using Tim's suggestion.