Add Zehr nifH database #1262

Job	Run time
Choose nextflow versions to test against depending on target branch	1s
nf-test (latest-everything, test, docker)	13m 38s
nf-test (latest-everything, test_single, docker)	5m 4s
nf-test (latest-everything, test_fasta, docker)	2m 59s
nf-test (latest-everything, test_failed, docker)	13m 40s
nf-test (latest-everything, test_multi, docker)	10m 57s
nf-test (latest-everything, test_reftaxcustom, docker)	5m 33s
nf-test (latest-everything, test_doubleprimers, docker)	8m 57s
nf-test (latest-everything, test_iontorrent, docker)	7m 8s
nf-test (latest-everything, test_novaseq, docker)	3m 56s
nf-test (latest-everything, test_pacbio_its, docker)	11m 45s
nf-test (latest-everything, test_sintax, docker)	13m 38s
nf-test (latest-everything, test_pplace, docker)	11m 42s
	1h 48m 58s

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