Add a script "idles" which opens a Python Shell window.

The default behaviour of idlefork idle is to open an editor window instead
of a shell. Complex expressions may be run in a fresh environment by
selecting "run".  There are times, however, when a shell is desired.
Though one can be started by "idle -t 'foo'", this script is more
convenient.  In addition, a shell and an editor window can be started
in parallel by "idles -e foo.py".
diff --git a/Lib/idlelib/setup.py b/Lib/idlelib/setup.py
index ba27bed..ecdf92e 100644
--- a/Lib/idlelib/setup.py
+++ b/Lib/idlelib/setup.py
@@ -77,5 +77,5 @@
                   'install_lib':idle_install_lib},
       package_dir = {idlelib:'.'},
       packages = [idlelib],
-      scripts = ['idle']
+      scripts = ['idle', 'idles']
       )