Hunter

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* Fixed a link in changelog.
* Fixed some issues in the Travis configuration.

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* Added :class:`hunter.predicates.From` predicate for tracing from a specific point. It stop after returning back to the
same call depth with a configurable offset.
* Fixed ``PYTHONHUNTERCONFIG`` not working in some situations (config values were resolved at the wrong time).
* Made tests in CI test the wheel that will eventually be published to PyPI
(`tox-wheel <https://pypi.org/project/tox-wheel/>`_).
* Made ``event.stdlib`` more reliable: ``pkg_resources`` is considered part of stdlib and few more paths will be
considered as stdlib.
* Dumbed down the ``get_peercred`` check that is done when attaching with ``hunter-trace`` CLI (via
``hunter.remote.install()``). It will be slightly insecure but will work on OSX.
* Added OSX in the Travis test grid.

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* Made ``threading_support`` on by default but output automatic (also, now ``1`` or ``0`` allowed).
* Added ``pid_alignment`` and ``force_pid`` action options to show a pid prefix.
* Fixed some bugs around ``__eq__`` in various classes.
* Dropped Python 3.3 support.
* Dropped dependency on `fields <https://python-fields.readthedocs.io/en/stable/>`_.
* Actions now repr using a simplified implementation that tries to avoid calling ``__repr__`` on user classes in order
to avoid creating side-effects while tracing.
* Added support for the ``PYTHONHUNTERCONFIG`` environment variable (stores defaults and doesn't activate hunter).

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* Fixed indentation in :class:`hunter.actions.CallPrinter` action (shouldn't deindent on exception).
* Fixed option filtering in Cython Query implementation (filtering on ``tracer`` was allowed by mistake).
* Various fixes to docstrings and docs.

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* Now ``Py_AddPendingCall`` is used instead of acquiring the GIL (when using GDB).

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* Added the :attr:`hunter.event.Event.count` and :attr:`hunter.event.Event.calls` attributes.
* Added the ``lt``/``lte``/``gt``/``gte`` lookups.
* Added convenience aliases for ``startswith`` (``sw``), ``endswith`` (``ew``), ``contains`` (``has``)
and ``regex`` (``rx``).
* Added a convenience :func:`hunter.wrap` decorator to start tracing around a function.
* Added support for remote tracing (with two backends: `manhole <https://pypi.org/project/manhole/>`__ and GDB) via
the ``hunter-trace`` bin. Note: **Windows is NOT SUPPORTED**.
* Changed the default action to :class:`hunter.actions.CallPrinter`.
You'll need to use ``action=CodePrinter`` if you want the old output.