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.
diff --git a/Tools/pynche/README b/Tools/pynche/README
index 1775884..2950d90 100644
--- a/Tools/pynche/README
+++ b/Tools/pynche/README
@@ -25,8 +25,7 @@
 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