Merge 3.2: Issue #12636: IDLE reads the coding cookie when executing a Python script.

And "IDLE: fix some RessourceWarning, reuse tokenize.open()"

diff --cc Misc/NEWS
index 01b72812bfd43a1e2d8ee43b2e67563fe87a32a6,c74cb5596d71f7f406ea39ae081fe1a69f5e177a..d83c12226c60f4c35fe373691e32f2de5829e928
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -271,15 -28,10 +271,17 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #12636: IDLE reads the coding cookie when executing a Python script.
+ 
 +- Issue #12494: On error, call(), check_call(), check_output() and
 +  getstatusoutput() functions of the subprocess module now kill the process,
 +  read its status (to avoid zombis) and close pipes.
 +
 +- Issue #12720: Expose low-level Linux extended file attribute functions in os.
 +
  - Issue #10946: The distutils commands bdist_dumb, bdist_wininst and bdist_msi
 -  now respect a --skip-build option given to bdist.
 +  now respect a --skip-build option given to bdist.  The packaging commands
 +  were fixed too.
  
  - Issue #12847: Fix a crash with negative PUT and LONG_BINPUT arguments in
    the C pickle implementation.