Move fetch_sequences.smk to fetch_from_ncbi.smk #228

Job	Run time
pathogen-ci (docker) / workflow-context	3s
pathogen-ci (conda) / workflow-context	4s
pathogen-ci (docker) / run-build	1m 28s
pathogen-ci (conda) / run-build	1m 51s
	3m 26s

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