Concatenate with scalar coordinate.
Review actions.
Generalise regular interpolation.
Preserve the datatype of time arrays converted with Unit.
Merge pull request #1385 from pelson/unit_convert_dtype

Preserve the datatype of time arrays converted with Unit.
Updated whatsnew for v1.7.2 release4
Merge pull request #1388 from dkillick/whatsnew-v1.7.2

DOC: Updated whatsnew for v1.7.2 release
Bump version to v1.7.2-rc.1
Merge pull request #1389 from dkillick/v172-rc1

Bump version to v1.7.2-rc.1
Bump version to v1.7.3-DEV
Merge pull request #1390 from dkillick/v173-dev

Bump version to v1.7.3-DEV
Add FieldCollation -> metadata conversion.

Adds iris.experimental.fieldsfile.convert_collation().
Add data attribute
Review changes
Rename _data attribute
Fixed a typo in `guess_coord_axis` docstring.
Merge pull request #1405 from ocefpaf/fix_typo

Fixed a typo in `guess_coord_axis` docstring.
Improve data tests
Changes for releasing v1.7.2
Merge pull request #1400 from rhattersley/collation-to-cube

Add FieldCollation -> metadata conversion.