Multicore- and UniprocessFuture assign globals themselves; don't pass… #414

Job	Run time
future.batchtools (release)	4m 11s
future.callr (release)	3m 23s
doFuture (release)	3m 30s
future.apply (release)	4m 23s
furrr (release)	4m 24s
doFuture (release) multisession	3m 40s
future.apply (release) multisession	4m 36s
furrr (release) multisession	4m 41s
future.apply (release) keepWhere	3m 59s
future.apply (release) !keepWhere	4m 13s
	41m 0s

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