Merge python.vim and python3.0.vim into python.vim

Merge Python 3 and Python 3 script versions into
the single python.vim script

TODO.txt

@@ -3,6 +3,7 @@ Now
 
 - Add support for slice syntax:
   http://img155.imageshack.us/img155/7767/screenshotgs.png
+
 - When we check spelling we don't need to check the whole strings only the
   content. For example we don't need to check 'u' for spelling in strings
   like this: u"Some text";
@@ -10,8 +11,6 @@ Now
 Later
 =====
 
-- Highligh errors where symbols follow by numbers like this: 0o123LaB
-
 - Need more accurate way to handle indentation errors. For example
   mixing spaces and tabs may be used for pretty formatting;