Add a method to clear all image caches for testing purposes. It
shouldn't be necessary anymore to call such a method in a production
environment or we have a problem with the image cache.

It depends how fine grained cache control should be.
If I format a lot of reports with company and division
logos in the headers, I'd probably like to keep them
in the cache across different rendering runs.
But this can be left for later fine tuning.


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