Agraph-python

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use getargspec only for Python 2.7
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Import "getargspec" and alias it as "getfullargspec" only if it's Python 2.x;
if it's Python 3.x, we import "getfullargspec" from "inspect" package
directly.

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rfe16865: support graphql queries in python
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New method ``evalGraphqlQuery`` has been added to ``RepositoryConnection``
class. It is a thin wrapper over the HTTP API:
https://franz.com/agraph/support/documentation/current/http-reference.html#backend-post-catalogs-repositories-graphql

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Make loading the module six an installation requirement
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Allow sparql queries inside a Jupyter notebook
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Also
Allow "root" to denote the root catalog
Update some module versions
Fix the specification of a protocol when creating a
connection.

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rfe16555: Add support for handling 204 responses from AG
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The AllegroGraph server, starting in vesion 7.1.0, may return
a 204 (no content) response when it knows that it will not
be returning any data. The client will
then create a null cursor, rather than creating an http
cursor which when used immediately returns 'no data left'

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rfe16523: query options API
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``RepositoryConnection`` class now provides a set of methods for
managing per-user/per-repository SPARQL query options. The methods
utilize a server-side API that is available in AllegroGraph v7.1.0 and
later and are similar to the namespace management methods:

- ``getQueryOptions()``
- ``getQueryOption()``
- ``setQueryOption()``
- ``removeQueryOption()``
- ``clearQueryOptions()``