Added QIIME2 custom reference database support. #1245

Job	Run time
Choose nextflow versions to test against depending on target branch	1s
Choose nextflow versions to test against depending on target branch	1s
nf-test (latest-everything, test, docker)	22m 27s
nf-test (latest-everything, test, docker)	22m 27s
nf-test (latest-everything, test_single, docker)	4m 53s
nf-test (latest-everything, test_single, docker)	4m 53s
nf-test (latest-everything, test_fasta, docker)	2m 58s
nf-test (latest-everything, test_fasta, docker)	2m 58s
nf-test (latest-everything, test_failed, docker)	15m 12s
nf-test (latest-everything, test_failed, docker)	15m 12s
nf-test (latest-everything, test_multi, docker)	33s
nf-test (latest-everything, test_multi, docker)	9m 9s
nf-test (latest-everything, test_reftaxcustom, docker)	6m 43s
nf-test (latest-everything, test_reftaxcustom, docker)	6m 43s
nf-test (latest-everything, test_doubleprimers, docker)	9m 17s
nf-test (latest-everything, test_doubleprimers, docker)	9m 17s
nf-test (latest-everything, test_iontorrent, docker)	5m 3s
nf-test (latest-everything, test_iontorrent, docker)	5m 3s
nf-test (latest-everything, test_novaseq, docker)	3m 40s
nf-test (latest-everything, test_novaseq, docker)	3m 40s
nf-test (latest-everything, test_pacbio_its, docker)	8m 13s
nf-test (latest-everything, test_pacbio_its, docker)	8m 13s
nf-test (latest-everything, test_sintax, docker)	17m 36s
nf-test (latest-everything, test_sintax, docker)	17m 36s
nf-test (latest-everything, test_pplace, docker)	11m 36s
nf-test (latest-everything, test_pplace, docker)	11m 36s
	3h 45m 0s

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