Dlisio

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* Metadata objects are now parsed and loaded when needed, rather than all at
once in ``dlisio.load()``. This is not directly observable for the user, other
than it improves performance for ``dlisio.load()``. For files with a lot of
metadata, the performance gain is huge.
* dlisio can now read even more curve-data. Specifically, where multiple FDATA
(rows) are stored in the same IFLR.
* The array from ``Frame.curves()`` now includes FRAMENO as the first column.
FRAMENO are the row numbers as represented in the file. It might happen that
there are missing rows or that they are out-of-order in the file, that is now
observable by inspecting FRAMENO.
* Better support for non-ascii strings. It is now possible to tell dlisio which
string encodings to try if decoding with 'utf-8' fails. Supply a list of
encodings o ``set_encodings()`` and dlisio will try them in order.
* ``Frame.index`` now returns the Channel mnemonic, not the ``Channel``-object.
* ``Channel.index`` is removed.
* Validated types are now represented as tuples, not lists.
* Fixes a bug were microseconds in datetime objects were interpreted as
milliseconds.
* Better error message when incomplete Channels objects cause parsing of curves
to fail as a result.

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* dlisio has learned to read curves with variable length data types. Thus,
every data-type that the standard allows for curves is now supported by
dlisio.
* ``Frame``- and ``Channel``-objects now have an index-property. ``index`` returns the
``Channel``-object that serves as the index-channel for the given Frame/Channel.

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* The sphinx documentation on readthedocs_ has a few new sections: About the
project, an introduction to some dlis-concepts and a quick guide to help new
users to get started with dlisio.
* API documentation has seen some improvements as well. The ``dlis``-class
documentation is revamped to better help users to work with logical files and
accessing objects. ``Frame`` and ``Channel`` are more thoroughly documented, and
more examples on how to work with curve data are provided.
* Direct access to specific objects has been made more convenient with
``dlis.object()``.
* ``dlis.match()`` is no longer case sensitive.
* ``dlis.fileheader`` now returns the ``Fileheader``-object directly, not wrapped as
dict_values.
* ``dlis.objects`` has been removed
* CircleCI is added to the ci-pipeline for building and testing on linux
* Python test suite has seen some refactoring
* It is now possible to build the python module with ``setup.py``, provided the
core library is already installed on the system.

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* Output a readable summary of any metadata-object, logical file or batch-object
with ``.describe()``.
* Access to curves directly through ``Frame``- and ``Channel``-objects.
* dlisio has learned to read the following metadata-objects: ``Process``, ``Path``,
``Splice``, ``Well reference point``, ``Group``, ``Message``, ``Comment``.
* ``dlis.match()`` lets you search for objects with a regular expression.
* dlisio now reads even more files. Restrictions such as number-of-objects in an
object_set and missing representation codes in templates have been lifted.
* The parsing routine has seen some improvements. This includes giving the user
more freedom to customize object-parsing.
* Multidimensional metadata attributes are handled correctly.
* ``BasicObject.update_stash`` has been removed.
* ``dlis.getobjects()`` has been removed.
* ``dlis.object_set`` has been renamed to ``dlis.indexedobjects``.
* ``Computation.source`` is now a scalar, not vector.
* ``BasicObject``'s ``type`` and ``attic`` is now attributes, not properties.
* Objects are allowed to have empty ids (name/mnemonic).
* The API documentation has seen some minor updates.
* dlisio uses endianness.h rather than its own implementation.
* Some of the binary test files have been simplified.
* core functionality such as ``findfdata``, ``findsul``, ``findvrl``, ``findoffsets`` and
``stream.at`` are more thoroughly tested.
* Parts of the Python test suite have been refactored.
* Fixed a bug were long obnames were allocated insufficient memory.
* Fixed a bug were multi-dimensional fdata were interpreted incorrectly.
* Fixed a bug that caused incorrectly partitioning from physical- to logical
file(s).
* Fixed a bug that caused parsing of a encrypted logical record to fail.

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* Support for logical files - dlisio now partitions the loaded physical file
into logical files. This has resulted in a behavioral change were
``dlisio.load()`` now returns a tuple-like object of n-logical files.