Cf-python

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**2014-03-13**

* Copes with PP fields with 365_day calendars
* Revamped CFA files in line with the evolving standard. CFA files
from PP data created with a previous version will no longer work.

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**2013-12-06**

* Improved API.
* Plenty of speed and memory optimisations.
* A proper treatment of datetimes.
* WGDOS-packed PP fields are now unpacked on demand.
* Fixed bug in functions.py for numpy v1.7. Fixed bug when deleting
the 'id' attribute.
* Assign a standard name to aggregated PP fields after aggregation
rather than before (because some stash codes are too similar,
e.g. 407 and 408).
* New subclasses of `cf.Coordinate`: `cf.DimensionCoordinate` and
`cf.AuxiliaryCoordinate`.
* A `cf.Units` object is now immutable.

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**2013-04-26**

* Fixed endian bug in CFA-netCDF files referring to PP files
* Changed default output format to NETCDF3_CLASSIC and trap error when
when writing unsigned integer types and the 64-bit integer type to
file formats other than NETCDF4.
* Changed unhelpful history created when aggregating

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**2013-04-24**

* Read and write CFA-netCDF files
* `cf.Field` creation interface
* New command line utilities: ``cfa``, ``cfdump``
* Redesigned repr, str and dump() output (which is shared with ``cfa``
and ``cfdump``)
* Removed superseded (by ``cfa``) command line utilities ``pp2cf``,
``cf2cf``
* Renamed the 'subset' method to 'select'
* Now needs netCDF4-python 0.9.7 or later (and numpy 1.6 or later)

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**2013-03-27**

* Fixed bug in ``cf/pp.py`` which caused the creation of incorrect
latitude coordinate arrays.

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**2013-02-20**

* Fixed bug in ``cf/netcdf.py`` which caused a failure when a file
with badly formatted units was encountered.

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