Ssh2-python3

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Changes
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* Added ``ssh2.channel.Channel.shell`` for opening interactive shells.


Fixes
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* ``ssh2.channel.Channel.process_startup`` would not handle request types with no message correctly.

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Fixes
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* Binary wheels would have bad version info and require `git` for installation - 17

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Changes
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* Enabled embedded libssh2 library functionality for versions >= 1.6.0.

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Changes
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* Implemented known host API, all functions.
* Added `hostkey` method on `Session` class for retrieving server host key.
* Added server host key verification from known hosts file example.
* Added exceptions for all known host API errors.

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Changes
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* Exceptions moved from C-API to Python module

Fixes
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* PyPy build support

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Changes
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* Implemented `last_errno` and `set_last_error` session functions
* Agent authentication errors raise exceptions
* C-API refactor
* SFTP IO errors raise exceptions

Fixes
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* Crash on de-allocation of channel in certain cases
* SFTP ``readdir_ex`` directory listing (long entry) was not returned correctly