Added QIIME2 custom reference database support. #1274

Job	Run time
Choose nextflow versions to test against depending on target branch	1s
nf-test (latest-everything, test, docker)	20m 26s
nf-test (latest-everything, test_single, docker)	5m 44s
nf-test (latest-everything, test_fasta, docker)	3m 1s
nf-test (latest-everything, test_failed, docker)	15m 13s
nf-test (latest-everything, test_multi, docker)	9m 48s
nf-test (latest-everything, test_reftaxcustom, docker)	7m 37s
nf-test (latest-everything, test_qiimecustom, docker)	6m 34s
nf-test (latest-everything, test_doubleprimers, docker)	9m 2s
nf-test (latest-everything, test_iontorrent, docker)	5m 39s
nf-test (latest-everything, test_novaseq, docker)	3m 56s
nf-test (latest-everything, test_pacbio_its, docker)	9m 43s
nf-test (latest-everything, test_sintax, docker)	17m 50s
nf-test (latest-everything, test_pplace, docker)	12m 47s
	2h 7m 21s

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