pmlmodelling/nctoolkit: v0.4.1

This is a minor release focusing on improving nctoolkit internals.

A new method, called check is introduced that can be used to troubleshoot data problems and to ensure there are no obvious data issues (such as a lack of CF-compliance).

Users can now access dataset calendars using ds.calendar.

The drop method now lets you remove time steps using the times argument.

The dataset attribute variables_detailed is now removed after being replaced by contents in version 0.3.9.

Some coding improvements have enhanced the performance of the add, subtract etc. methods.

This version will recommend a CDO version of at least 1.9.7, because ensuring nctoolkit compatibility with earlier versions was becoming difficult and likely of little need to users.

The methods multiply etc. failed when datasets did not have time as a dimension in version 0.4.0. This is now fixed. Previously, ds.contents always returned None for the number of time steps. Now fixed.