Patch by Serhiy Storchaka (in PR #9642).

Part 2 of 3.  Continues PR #7689, changeset ee5ef309.
Edit and add tests for 18 modules, help_about to replace and run.

Save a bit of code, plus non-tuples get converted anyway to tuples by tkinter for the tk call.

In 3.6, the warning is now called an error, making it harder to ignore.

This follows the previous patch that changed idlelib file names.
Class names that matched old module names are not changed.
Change idlelib imports in turtledemo.__main__.

Exception: config-extensions.def.  Previously, extension section
names, file names, and class names had to match.  Changing section
names would create cross-version conflicts in config-extensions.cfg
(user customizations).  Instead map old names to new file names
at point of import in editor.EditorWindow.load_extension.

Patch extensively tested with test_idle, idle_test.htest.py, a custom
import-all test, running IDLE in a console to catch messages,
and testing each menu item.  Based on a patch by Al Sweigart.

Augment htest to include all major IOBinding functions.

This associates the message box with the widget and is better for Mac OSX.
Patch by Mark Roseman.

Patch by Saimadhav Heblikar

* The first line of Python script could be executed twice when the source
encoding (not equal to 'utf-8') was specified on the second line.

* Now the source encoding declaration on the second line isn't effective if
the first line contains anything except a comment.

* As a consequence, 'python -x' works now again with files with the source
encoding declarations specified on the second file, and can be used again
to make Python batch files on Windows.

* The tokenize module now ignore the source encoding declaration on the second
line if the first line contains anything except a comment.

* IDLE now ignores the source encoding declaration on the second line if the
first line contains anything except a comment.

* 2to3 and the findnocoding.py script now ignore the source encoding
declaration on the second line if the first line contains anything except
a comment.

now detect Python source code encoding only in comment lines.

changing IOError to OSError (#16715).

special characters in the file path.

special characters in the file path.

default on Windows and OS X as it already does with X11 Tk.

Code patch by Roger Serwy.

Code patch by Roger Serwy.

even when parent window is closed. Patch by Roger Serwy.

even when parent window is closed. Patch by Roger Serwy.

when opening a long file.  With Tk 8.5, the first line was hidden.

when opening a long file.  With Tk 8.5, the first line was hidden.

Backport 70055:35ed0efd7dd3

_tkinter.c is returning <class '_tkinter.Tcl_Obj'> sometimes.  Don't use
tkinter.messagebox.Message - use the helper functions which convert to str.

Merged from 86702

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r79576 | florent.xicluna | 2010-04-02 10:24:52 +0300 (Fri, 02 Apr 2010) | 2 lines

  #7092: Fix additional "-3" warnings in the idlelib package, and convert to absolute imports.
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  r79577 | florent.xicluna | 2010-04-02 11:15:26 +0300 (Fri, 02 Apr 2010) | 2 lines

  #7092: Drop the cmp argument.
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  r79578 | florent.xicluna | 2010-04-02 11:30:21 +0300 (Fri, 02 Apr 2010) | 2 lines

  #7092: silence some py3k warnings
........

no encoding declaration and are not encoded in UTF-8.