Cf-python

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**2017-11-10**

* Disallowed raising offset units to a power (e.g. taking the square
of data in units of K 273.15).
* Removed len() of `cf.Field` (previously always, and misleadingly,
returned 1)
* Fixed setting of cell methods after climatological time collapses
* Added printing of ncvar in `cf.Field.__str__` and `cf.Field.dump`
* Added user stash table option to ``cfa`` script

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**2017-10-30**

* Misc. bug fixes

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**2017-09-28**

* Removed error when `cf.read` finds no fields - an empty field list
is now returned
* New method `cf.Field.count`

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**2017-09-19**

* Bug fix when creating wrap-around subspaces from cyclic fields
* Fix (partial?) for memory leak when reading UM PP and fields files

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**2017-09-15**

* submodel property for PP files
* API change for `cf.Field.axis`: now returns a `cf.DomainAxis` object
by default
* Bug fix in `cf.Field.where`
* Bug fix when initialising a field with the source parameter
* Changed default output format to NETCDF4 (from NETCDF3_CLASSIC)

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**2017-08-01**

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