Dliswriter

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**Representation codes**

* Fixed representation codes for numpy dtypes.
* Tests & improvements for utils (repr code converter, source data wrappers, etc.).

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**Cleanup**

* Some name changes, restructuring.
* Updated README.

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**All DLIS objects added**

* Exposed all types of DLIS objects (WellReferencePoint, Group, Message, etc.)
in ``DLISFile`` through ``add_<object>`` methods (e.g. ``add_group``).

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**Instantiating ELFRObjects directly**

* Each ``EFLRObject`` (later renamed to ``EFLRItem``) can be initialised directly by calling the constructor
of the relevant class (before they were initialised through the corresponding ``EFLR``, later renamed to ``EFLRSet``).

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**More DLIS objects**

* Added support for more objects (Zone, Splice, Axis) to the ``DLISFile``.

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**First release**

* New structure of the repository, compliant with WellID standards.