Move items from NEWS to idlelib/NEWS.txt. Standardize headers spacing: 2 lines

above "What's New and 0 lines above "Release date".  Remove most old headers
for non-final releases (they currently do not get carried forward.

diff --cc Lib/idlelib/NEWS.txt
index be063c4cc06586d08bf601c36a2ce4e5bd1a6e41,95b9737330836a33bf95fa630d8419f58cff514d..daf54bc8cbac5706943f83189717a7099d8033a5
--- 1/Lib/idlelib/NEWS.txt
--- 2/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@@ -1,7 -1,22 +1,27 @@@
 -What's New in Idle 3.4.4?
++What's New in IDLE 3.5.1?
+ =========================
 -*Release date: 2015-??-??*
++*Release date: 2015-09-13*
+ 
+ - Issue #25199: Idle: add synchronization comments for future maintainers.
+ 
+ - Issue #16893: Replace help.txt with idle.html for Idle doc display.
+   The new idlelib/idle.html is copied from Doc/build/html/idle.html.
+   It looks better than help.txt and will better document Idle as released.
+   The tkinter html viewer that works for this file was written by Rose Roseman.
+   The now unused EditorWindow.HelpDialog class and helt.txt file are deprecated.
+ 
+ - Issue #24199: Deprecate unused idlelib.idlever with possible removal in 3.6.
+ 
+ - Issue #24782: In Idle extension config dialog, replace tabs with sorted list.
+   Patch by Mark Roseman.
+ 
+ - Issue #24790: Remove extraneous code (which also create 2 & 3 conflicts).
+ 
++
 +What's New in IDLE 3.5.0?
 +=========================
- *Release date: 2015-09-13* ??
++*Release date: 2015-09-13*
 +
  - Issue #23672: Allow Idle to edit and run files with astral chars in name.
    Patch by Mohd Sanad Zaki Rizvi.
  
@@@ -180,11 -211,11 +200,6 @@@ What's New in IDLE 3.1b1
  - Use of 'filter' in keybindingDialog.py was causing custom key assignment to
    fail.  Patch 5707 amaury.forgeotdarc.
  
--
--What's New in IDLE 3.1a1?
--=========================
--*Release date: 07-Mar-09*
--
  - Issue #4815: Offer conversion to UTF-8 if source files have
    no encoding declaration and are not encoded in UTF-8.
  
@@@ -198,6 -229,7 +213,7 @@@
  - Issue #2665: On Windows, an IDLE installation upgraded from an old version
    would not start if a custom theme was defined.
  
 -  
++
  What's New in IDLE 2.7? (UNRELEASED, but merged into 3.1 releases above.)
  =======================
  *Release date: XX-XXX-2010*
@@@ -223,11 -255,11 +239,6 @@@
  
  - Issue #3549: On MacOS the preferences menu was not present
  
 -
--What's New in IDLE 3.0 final?
--=============================
- 
--*Release date: 03-Dec-2008*
--
  - IDLE would print a "Unhandled server exception!" message when internal
    debugging is enabled.
  
@@@ -237,12 -269,11 +248,6 @@@
  - Issue #4383: When IDLE cannot make the connection to its subprocess, it would
    fail to properly display the error message.
  
--
--What's New in IDLE 3.0a3?
--=========================
- 
--*Release date: 29-Feb-2008*
--
  - help() was not paging to the shell.  Issue1650.
  
  - CodeContext was not importing.
@@@ -254,21 -285,19 +259,9 @@@
  
  - Issue #1585: IDLE uses non-existent xrange() function.
  
--
--What's New in IDLE 3.0a2?
--=========================
- 
--*Release date: 06-Dec-2007*
--
  - Windows EOL sequence not converted correctly, encoding error.
    Caused file save to fail. Bug 1130.
  
--
--What's New in IDLE 3.0a1?
--=========================
- 
--*Release date: 31-Aug-2007*
--
  - IDLE converted to Python 3000 syntax.
  
  - Strings became Unicode.
@@@ -525,9 -521,9 +485,9 @@@ What's New in IDLE 1.2
  - The remote procedure call module rpc.py can now access data attributes of
    remote registered objects.  Changes to these attributes are local, however.
  
 -  
++
  What's New in IDLE 1.1?
  =======================
- 
  *Release date: 30-NOV-2004*
  
  - On OpenBSD, terminating IDLE with ctrl-c from the command line caused a