Add a test case for issue 41.

These particular latitudes are extracted from a dataset I was having this issue with.

--HG--
branch : release-0.7
Minor bug fix for ufunc - need to set the 'name' attribute *after* calling combine_meta, otherwise we lose the name we just created.

--HG--
branch : release-0.7
Add support for more recent netCDF data types.

This is a partial resolution of issue 54, but there is still no support for
strings of arbitrary length.

--HG--
branch : release-0.7
Release 0.7.3.

--HG--
branch : release-0.7
Added tag 0.7.3 for changeset 7bafc0b811e2

--HG--
branch : release-0.7
Fix the last "fix" to netcdf.

When saving a version 3 file, a lot of these new data types are not available,
so need to have 2 variants of the data type lookup table.

Also, forgot a couple of lookup tables related to saving/loading variables.

--HG--
branch : release-0.7
Added tag 0.7.3a for changeset 32bac361a52c

--HG--
branch : release-0.7
Merge in some updates from release-0.7.

In particular:
 - Support for new netcdf data types
 - Minor bug fix in ufunc
 - Unit test for issue 41