Add test of the, currently internal, capture_journals() function #348

Job	Run time
future.batchtools (release)	3m 58s
future.callr (release)	2m 25s
doFuture (release)	3m 1s
future.apply (release)	3m 27s
furrr (release)	4m 30s
doFuture (release) multisession	3m 16s
future.apply (release) multisession	3m 48s
furrr (release) multisession	4m 25s
future.apply (release) keepWhere	3m 35s
future.apply (release) !keepWhere	4m 1s
	36m 26s

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