Refresh build system post release of 1.3.0. Port the various helper
scripts to Python3 and remove JRE 1.6 support as that is well EoL-ed by
now.

make use of requests library to handle TLS

Closes #4

See merge request !4

Code-side changes for #1

Remove the unsupported Python 2 client's code.

Rather than rolling our own SSL wrapper, make use of the one in
requests. Allow a custom requests.Session object to be passed into the
connection if custom behaviour such as CA pinning is required.

Closes #4

PHP: Remove use of own cacerts.txt file

Closes #5

See merge request !3

Resolve "Python3 client fails to serialize attributes"

Closes #2

See merge request !2

Add README and remove building support for Python 2 libraries

Add setup.py to allow for pip installation

See merge request uis/sysdev/devgroup/ibis/ibis-client!1

Minimal setup.py enables installation as a Python package using
pip, e.g. `pip install .` from within the directory.

Could also be used directly from the git repository, for example
in `setup.py`:

```python
setup(
    install_requires=[
        "ibisclient @ git+https://gitlab.developers.cam.ac.uk/uis/sysdev/devgroup/ibis/ibis-client.git"
    ]
...
)
```

updates.

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(LQL) can be used through the API.

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updates.

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container, holding the specific version of ApiGen known to produce
decent results.

This is necessary because that version of ApiGen requires PHP 5 (it
doesn't work with PHP 7), and newer versions of ApiGen are currently
completely broken, and don't support half the options necessary to
produce decent output.

The docker container is based on alpine (just about the smallest
linux distro available), with the required PHP 5 packages, and ApiGen
copied in.

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The old technique was horribly out-dated, and no longer worked on my
machine, following an OS upgrade.

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client to use the latest TLS version available on both the client and
the server.

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by both the client and the server.

Currently, the server supports TLS 1.0, 1.1, 1.2 and 1.3 (and no SSL
versions).

Back when this code was written, it only supported SSLv3 and TLS 1.0,
so forcing TLS 1.0 made sense, but things have move on since then.

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method to return all people (in batches, sorted by CRSid).

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Also included the root certificates themselves, and all intermediate
certificates we have ever used, just for reference, and instructions
on how cacerts.txt is constructed (from the root certificates alone).

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QuoVadis root certificate for the python and PHP clients. Java ships
this by default, starting with Java 8u91.

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