2) Add rigorous error analysis to _mpd_qlog10 (ACL2 proofs exist).

3) Use the relative error as a basis for the interval generation in the
   correction loop (same as in _mpd_qln()).

The strict checks and netmask computing don't make sense if constructed with
a ALL_ONES mask based on addresses. Also fix a bug due to mis-indentation of
a return statement in the same code block.

use. Make the get_entity 'method' a module function as it did not use 'self'.
Delete buggy _find_constructor function that is not needed, at least in 3.x.
Revise get_argspec so all tests pass.  Add and fix NEWS entries.

   List all of them in the comment.

2) Use the recently stated relative error of _mpd_qln() to generate the
   interval for the exact value of ln(x). See also the comment in mpd_qexp().

with VS2010sp1

Previously multiprocessing only expected int or str.  It also wrongly
used an exit code of 1 when the argument was a string instead of zero.

Initial patch by mouad

2) Simplify the precision adjustment code for values in [0.900, 1.15].

Close #6203: Document that Python 3 sets LC_CTYPE at startup to the user's preferred locale encoding

before their mutexes.

open() and io.TextIOWrapper are now calling locale.getpreferredencoding(False)
instead of locale.getpreferredencoding() in text mode if the encoding is not
specified. Don't change temporary the locale encoding using locale.setlocale(),
use the current locale encoding instead of the user preferred encoding.

Explain also in open() documentation that locale.getpreferredencoding(False) is
called if the encoding is not specified.

- remove duplicate netmask/hostmask code
- make two ifs more pythonic
- remove packed property for networks
- some minor pep8 stuff
- Test coverage is now at 97%, the rest are mostly unreachable safeguards.

The fileobj argument was added during the 3.3 development cycle, so this change
does not break backward compatibility with 3.2.

This clears up an error in detected by refleak mode that showed up when
test_smtplib was run after test_smtpd in the same refleak run.

_BaseNetwork contained (faulty) methods for creating string representations.
I've fixed them and put them to use by eliminating identical overrides.