Cfdm

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**2019-11-07**

* Fixed bug relating to setting of parameters on datum and coordinate
conversion objects of coordinate conversion constructs
(https://github.com/NCAS-CMS/cfdm/issues/6).

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**2019-10-04**

* During writing to netCDF files, ensured that _FillValue and
missing_value have the same data type as the data.
* Fixed bug during construct equality testing that didn't recognise
equal cell method constructs in transposed, but otherwise equal
field constructs.
* Bounds netCDF dimension name is now saved, and can be set. The
saved/set value is written out to disk.
* Now reads CDL files (https://github.com/NCAS-CMS/cfdm/issues/5)

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**2019-06-13**

* Don't set the fill mode for a `netCDF4.Dataset` open for writing to
`off`, to prevent incorrect reading of some netCDF4 files
(https://github.com/NCAS-CMS/cfdm/issues/4).
* Updated documentation

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**2019-06-05**

* Added attributes `_ATOL` and `_RTOL` to facilitate subclassing.
* Fixed bug in `cfdm.Field.convert`.
* Fixed bug in `cfdm.core.constructs.new_identifier`.

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**2019-05-15**

* New methods: `Datum.nc_has_variable`, `Datum.nc_get_variable`,
`Datum.nc_has_variable`, `Datum.nc_set_variable`
(https://github.com/NCAS-CMS/cfdm/issues/3).

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**2019-05-14**

* Changed behaviour of `cfdm.Constructs.filter_by_axis`.
* New methods: `cfdm.Data.has_units`, `cfdm.Data.has_calendar`,
`cfdm.Data.has_fill_value`.
* New ``constructs`` keyword parameter to `Field.transpose`.
* Keyword parameter ``axes`` to `cfdm.Field.set_data` is now optional.
* Added the 'has_bounds' method to constructs that have data but can't
have bounds.
* New methods: `cfdm.DomainAxis.nc_is_unlimited`,
`cfdm.DomainAxis.nc_set_unlimited`.
* Made Data a virtual subclass of Array.
* Deprecated methods: `cfdm.Field.nc_unlimited`,
`cfdm.Field.nc_clear_unlimited`, `cfdm.Field.nc_clear_unlimited`.
* Fixed bug when writing new horizontal coordinate reference for the
vertical datum.
* Fixed bug in `del_data` methods.
* Fixed bug with in-place operations.
* Fixed bug with position in some `insert_dimension` methods.
* Fixed bug that sometimes made duplicate netCDF dimensions when
writing to a file.
* Added _shape keyword to `cfdm.Field.set_data_axes` to allow the data
shape to be checked prior to insertion.
* Added the '_custom' attribute to facilitate subclassing.
* New class `cfdm.mixin.NetCDFUnlimitedDimension` replaces
`cfdm.mixin.NetCDFUnlimitedDimensions`, which is deprecated.
* New method `cfdm.CFDMImplementation.nc_is_unlimited_axis` replaces
`cfdm.CFDMImplementation.nc_get_unlimited_axes`, which is
deprecated.
* New method `cfdm.CFDMImplementation.nc_set_unlimited_axis` replaces
`cfdm.CFDMImplementation.nc_set_unlimited_dimensions`, which is
deprecated.

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