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WIP: enable zst compression using new compress= kwarg

Leo P. Singer requested to merge leo-singer/igwn-ligolw:zstandard-compression into master

FIXME: The one-liner expression that many scripts have to pass to write_filename will become unwieldy as the number of available compression methods grows from 1 to 2 or even more. Instead of this:

write_filename(
	filename,
	compress = compress = 'gz' if (options.output or "stdout").endswith(".gz") else False
)

this patch proposes a new compress_for_filename helper function:

write_filename(
	filename,
	compress = compress_for_filename(filename)
)

However, even this breaks the DRY principle.

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