Moved the main pynche.py file to Main.py. Added minimal driver

scripts pynche.py and pynche.pyw for Unix and Windows startup
respectively.  Document the .pyw file in the README.

Tools/pynche/Main.py

-#! /usr/bin/env python
-
 """Pynche: The PYthon Natural Color and Hue Editor.
 
 Pynche is based largely on a similar color editor I wrote years ago for the

Tools/pynche/PyncheWidget.py

@@ -101,7 +101,7 @@ class PyncheWidget:
         return self.__root
 
     def __popup_about(self, event=None):
-        from pynche import __version__
+        from Main import __version__
         tkMessageBox.showinfo('About Pynche ' + __version__,
                               '''\
 Pynche %s

Tools/pynche/README

@@ -25,8 +25,7 @@ this reason, but you can use a different file with the -d option.  The
 file xlicense.txt contains the license only for rgb.txt.
 
 Pynche is pronounced `Pinch-ee'.  Start it by running the pynche.py
-driver.  On Windows, you probably want to rename pynche.py to
-pynche.pyw so that it doesn't bring up a console window.
+driver.  On Windows, run pynche.pyw to inhibit the console window.
 
 The top part of the main Pynche window contains the "variation
 strips".  Each strip contains a number of "color chips".  The strips

Tools/pynche/pynche

+#! /usr/bin/env python
+
+"""Run this file under Unix, or when debugging under Windows.
+Run the file pynche.pyw under Windows to inhibit the console window.
+"""
+import Main
+Main.main()

Tools/pynche/pynche.pyw

+#! /usr/bin/env python
+
+"""Run this file under Windows to inhibit the console window.
+Run the file pynche.py under Unix or when debugging under Windows.
+"""
+import Main
+Main.main()