Improve parsing of GenBank / GFF files #1852

Job	Run time
pathogen-repo-ci (avian-flu)	40s
test (python=3.8 biopython=1.76)	7m 13s
pathogen-repo-ci (ebola)	55s
test (python=3.8 biopython=1.79)	7m 1s
pathogen-repo-ci (lassa)	49s
test (python=3.8 biopython=1.80)	6m 54s
pathogen-repo-ci (mumps)	1m 5s
test (python=3.8 biopython=latest)	7m 16s
pathogen-repo-ci (ncov)	1m 10s
test (python=3.9 biopython=1.79)	7m 9s
pathogen-repo-ci (rsv)	2m 27s
test (python=3.9 biopython=1.80)	6m 55s
pathogen-repo-ci (seasonal-flu)	56s
test (python=3.9 biopython=latest)	7m 12s
pathogen-repo-ci (tb)	1m 20s
test (python=3.10 biopython=1.80)	7m 3s
pathogen-repo-ci (zika)	50s
test (python=3.10 biopython=latest)	7m 0s
test (python=3.11 biopython=1.80)	7m 12s
test (python=3.11 biopython=latest)	7m 10s
build-docs / build-conda	0s
build-docs / build-pip	51s
codecov	0s
	1h 29m 8s

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