ENH: provide extra log feedback when catalyst function objects end.
- Note that stopping the catalyst function object via a `timeEnd` value does not actually call the corresponding end() method. See: Development/OpenFOAM-plus#791 ENH: support mkdir as dictionary keyword - this is a convenient means of creating an output directory from within the function object without corresponding python or shell script. Some pipelines (image generation) balk if the output directory does not exist. Others (vtm writer etc) will create their own.
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