Ssh2-python3

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Changes
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Clean up manylinux builds a little (but it's still not working right).

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Changes
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Add signal message support.

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Changes
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* Forked from ssh2-python and renamed ssh2-python3. The reason being:
* Fix a bug where Python would segfault when GC was performed under certain conditions.
* Use Python's internal PyMalloc for libssh2 allocator.
* Add generic message method that allows Python code to form a packet.
* Support for Python 3 only, remove Python 2 support.
* Add support for setting up forward to remote Unix socket.

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Changes
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* Session object de-allocation no longer calls session disconnect.
* Channel object de-allocation no longer calls channel close.
* Rebuilt sources with Cython ``0.29.6``.
* Updated Linux and Windows binary wheels to OpenSSL 1.1.
* Updated embedded ``libssh2`` to latest master.
* Added ``Ed25519`` publickey support via ``libssh2`` and OpenSSL upgrades.

Packaging
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* Source distribution builds would not include embedded libssh2 module in package - 51
* Removed OSX 10.10 binary wheel builds - deprecated by Travis-CI.
* Updated embedded OpenSSL version for Windows wheel builds.

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Packaging
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* Updated embedded OpenSSL version for Windows wheel builds.

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Packaging
----------

* Source distribution builds would not include embedded libssh2 module in package - 51
* Removed OSX 10.10 binary wheel builds - deprecated by Travis-CI.