Cf-python

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**2017-01-31**

* Rounded datetime to time-since conversions to the nearest
microsecond, to reflect the accuracy of netCDF4.netcdftime
* Fix for netCDF4.__version__ > 1.2.4 do to with datetime.calendar
*handle with care*

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**2016-09-21**

* Added --build-id to LDFLAGS in umread Makefile, for sake of RPM
builds (otherwise fails when building debuginfo RPM). Pull request
16, thanks to Klaus Zimmermann.
* Improved test handling. Pull request 21, thanks to Klaus
Zimmermann.
* Removed udunits2 database. This removes the modified version of the
udunits2 database in order to avoid redundancies, possible version
incompatibilities, and license questions. The modifications are
instead carried out programmatically in units.py. Pull request 20,
thanks to Klaus Zimmermann.

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**2016-09-09**

* New method: `cf.Field.unlimited`, and new 'unlimited' parameter to
`cf.write` and ``cfa``

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**2016-09-05**

* Removed asreftime, asdatetime and dtvarray methods
* New method: `convert_reference_time` for converting reference time
data values to have new units.

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**2016-08-23**

* Fixed bug in `cf.Data.equals`

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**2016-08-22**

* Fixed bug in binary operations to do with the setting of
`Partition.part`
* Added `cf.TimeDuration` functionality to get_bounds cellsizes
parameter. Also new parameter flt ("fraction less than") to position
the coordinate within the cell.

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