Proposed addition to allow categorisation of 2D coords
Review actions
Default LBUSER(2) to -99 when saving to PP
tests around bounds, and messages on DimCoord constructor errors
Fix docs for COUNT and PROPORTION aggregators.
modify documentation of cube constructor to reflect a wider range of data types
Merge pull request #866 from rhattersley/pp-lbuser2

Default LBUSER(2) to -99 when saving to PP
Merge pull request #867 from rhattersley/fix-count-docs

Fix docs for COUNT and PROPORTION aggregators.
Merge pull request #865 from jkettleb/bounds_doc

Documentation clarifying shape of bounds, adding tests to verify expected behaviour
Merge pull request #862 from jkettleb/doc

Small modification to documentation around cube constructor
Merge pull request #861 from dkillick/coord_cat_2d

Categorisation of multi-dimensional coords.
Work in progress implementation of better datetime constraints.
Added tests for PartialDateTime.
WIP.
MAINT: Pep8 and flake changes.
ENH: Extended PartialDateTime unittests.
ENH: Compare Cell point when datetime with numeric
ENH: Cell comparison with netcdftime.datetime

Added capability for cell to handle netcdftime.datetime and datetime
generically.  Also fixed the isinstance mocking within unittests.
MAINT: Moved mocked isinstance into unit test init
ENH: Ability to handle partial datetimes.

Now added capability for handling partial dates for all comparison
operators.