Pgxnclient

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- Fixed crash on input (ticket 42)

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- Fixed error running ``pgxn`` with no argument (ticket 38).
- Ignore ``.psqlrc`` file in all commands (ticket 39).
- Fixed PostgreSQL version number parsing after v10 (ticket 40).
- Added test files to the sdist package (ticket 36).
- ``tests`` directory not included in the installed package (ticket 37).

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- Use https by default to access the PGXN API.
- Dropped support for Python < 2.7 and Python 3 < 3.4.
- Logging information emitted on stderr instead of stdout.
- Exit with nonzero return code after command line parsing errors (ticket 23).
- Don't fail if some directories in the ``PATH`` are not readable (ticket 24).
- Don't file emitting non-ascii chars with stdout redirected (ticket 26).
- Fixed parsing of server version numbers with PostgreSQL beta versions
(ticket 29).
- Use six to make the codebase portable between Python 2 and 3.

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- Fixed traceback on error when a dir doesn't contain META.json (ticket 19).
- Handle version numbers both with and without hyphen (ticket 22).

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- Packages can be downloaded, installed, loaded specifying an URL
(ticket 15).
- Added support for ``.tar`` files (ticket 17).
- Use ``gmake`` in favour of ``make`` for platforms where the two are
distinct, such as BSD (ticket 14).
- Added ``--make`` option to select the make executable (ticket 16).

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- Dropped support for Python 2.4.
- ``sudo`` is not invoked automatically: the ``--sudo`` option must be
specified if the user has not permission to write into PostgreSQL's libdir
(ticket 13). The ``--sudo`` option can also be invoked without argument.
- Make sure the same ``pg_config`` is used both by the current user and by
sudo.