Paragraph

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Changed
'''''''
- The ``op`` decorator now copies the ``__doc__`` attribute of the underlying function onto the wrapping ``Op`` instance

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Changed
'''''''
- attribute ``Op.thread_safe`` is now a keyword-only argument of ``__init__`` to permit attributes without default values in derived classes.

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Fixed
'''''
- the API doc is now included

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Deprecated
''''''''''
- support for unresolved output variables in ``session.evaluate``, use ``sessions.solve`` for that purpose
- support for arguments of type Variable in ``Op.__call__``, use ``Op.op`` instead

Changed
'''''''
- simplify ``op`` decorator
- simplify default implementation of ``Op.__repr__``
- complete rewrite of the readme

Added
'''''
- method ``Op.op`` to be used in place of direct invocation of an Op instance when building a graph
- the ``Variable`` class, the ``op`` decorator and the functions ``evaluate``, ``apply``, ``solve`` and ``solve_requirements`` are now exposed at package
level.

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Fixed
'''''
- mistyped variable name breaks ``session.apply``

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Added
'''''
- initial version of source code