pmlmodelling/nctoolkit: v0.3.5

This is a minor release focusing on some under-the-hood improvements in performance and a couple of new methods. It drops support for CDO version 1.9.3, as this is becoming too time-consuming to continue given the increasingly low reward. A couple of new methods have been added. distribute enables files to be split up spatially into equally sized m by n rectangles. collect is the reverse of distribute. It will collect distributed data into one file. In prior releases assign calls could not be split over multiple lines. This is now fixed. There was a bug in previous releases where regrid did not work with multi-file datasets. This was due to the enabling of parallel processing with nctoolkit. The issue is now fixed. The deprecated methods mutate and assign have now been removed. Variable creation should use assign