Fix saving to in-memory file-like objects in Postscript backend #2512
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This is a follow on to #2498. (I tried to make a PR against @megies branch, but github won't let me for some reason).
This opened up a whole can of worms, exacerbated by the fact that there are 3 of these file-like objects all with subtley different behavior, and we want to support all of them.