Rearrange code for writable() case to make the parallel logic clearer

Fixes SF #984290.

a typo.

Patch from Mark Hammond:

bdist_wininst attempts to use the correct MSVC runtime for the current
version of Python. This doesn't work correctly when --target-version
is set. In that case, bdist_wininst still uses the *current*
sys.version (ie, 2.4) rather than the version specified as
--target-version. Thus, the msvc7 runtime based executable stub is
*always* used.

This patch "hard-codes" knowledge of earlier Python versions,
providing the correct result when Python 2.4 is used to build Python
2.3 and earlier distributions.

Remove the short variant (-v) of the --target-version command line
options, it conflicts with the --verbose/-v standard distutils switch.

the checkin.

Windows (XP at least ;).  Test in this order: echo, daytime, domain.

* Add a test case that would have caught it.

  for lists of mixed types.
* Test that sort works.

* Make ConversionSyntax signals get trapped by default.

* Added a recipe section.

* Make capitals default part of DefaultContext

This serves to made the context representation more useful (the names in
match the names out).

Removed the link to ReXX.  That document did not shed add anything to
information already in the spec.

Further tighten the public API to improve usability:

* Emax and Emin are set through Context().  Their defaults are set in the
  DefaultContext, so there is no need to expose DEFAULT_MAX_EXPONENT
  and DEFAULT_MIN_EXPONENT.

* The string functions isnan() and isinfinity() were only used internal to
  the module and were not among the test cases.  External use cases are
  served by the Decimal constructor.  So, made these private.

and format the warning similarly to an exception for both that check and for
warnings raised in the subprocess.

M NEWS.txt
M Pyshell.py
M ScriptBinding.py
M run.py

* delete temporary globals immediately after use
* move a global into a class variable
* Rename BasicDefaultContext and ExtendedDefaultContext
  to BasicContext and ExtendedContext.

* Change the default precision to 28 (to match VB's decimal type).

Refactored RotatingFileHandler to create a base class  for rotating handlers. Added TimedRotatingFileHandler.

Added error checking to log() to check that level is an integer, and raise a TypeError if not (as long as raiseExceptions is set).
Minor documentation corrections.

Moved example section up to just after the section on Logger objects, and changed it to use the new basicConfig() API

* Added test for pickling contexts
* Renamed ExceptionList to Signals (to match wording in the spec)
* Simplified Context constructor by allowing flags=None to automatically
  generate a zeroed-out flags dictionary.
* inlined _convertString() which was used only once
* _rounding_decision is private, so excluded its contants from __all__.
* added an XXX comment with concerns about subclassing signals results in
  a deviation from the spec (maybe important, maybe not).
* Taught the test_suite to determine its own directory (modeled after code
  in regrtest.py).  Enables it to be run when the current directory is not
  the test directory.
* Added a clear_flags() method to the Context API to make it easier to do
  a common operation with flags.
* Fixed the trap_enablers defaults in BasicDefaultContext to match the spec.