Esgf-pyclient

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- Fix: fix tests and merge conflicts (79).
- Fix 75: ignore_facet_check search option appears to be broken (76).
- Fix 74: Add warnings when default facets=* used on distributed search (77).
- Fix 78: Updates for requests_cache API (68).
- Fix: Improvements to tests (73).

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- Added test for batch size (66).
- Test notebooks (65).
- Replaced Travis CI by GitHub actions CI (64).
- Return globus urls in search (63).
- Fixed build of Search API (61).
- Remove unused code (49).
- Cleaned up tests (45).
- Using ``webob.multidict`` (43).
- Cleaned up docs (39).
- Marked slow tests (38).
- Added notebook examples (37, 46, 48).
- Fixed the usage of the ``input()`` method in ``logon.py`` (36).
- Skip Python 2.x (35).

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- Fixed test suite (33)
- Added badges for RTD and Travis CI to Readme.

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This release includes the following features:

- The library now supports **Python 3**.
- ``verify`` option in ``LogonManager`` has been added.
- Works with Python 3 version of ``MyProxyClient``.
- Testing structure with ``pytest`` has been improved.

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This release includes the following changes:

- The tests have been updated and various fixes made to make them match the up-to-date ESGF Search API.
- Following problems with the search being slow in certain scenarios an extra call to the Search service
was made optional through the ``SearchContext.search()`` method. If you send the argument and value
of ``ignore_facet_check=True`` then this hidden call to the service will be avoided. This typically saves
2 seconds of wait time which can be very important in some iterative search scenarios.
- The ``SearchContext.search()`` method was also extended so that the argument ``batch_size`` could be
directly sent to it in order to manage how the calls to the API would be separated out into batches. This
does not affect the final result but may affect the speed of the response. The batch size can also be set
as a default in the ``pyesgf.search.consts`` module.
- Searches at the file-level now return a ``gridftp_url`` property along with other existing properties such
as ``download_url``.

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This release includes a fix for Issue 4 to cope with ESGF Search end points
being given with or without a ":port" component in the host address.