Improve parsing of GenBank / GFF files #1869

Job	Run time
pathogen-repo-ci (avian-flu)	40s
test (python=3.8 biopython=1.76)	6m 57s
pathogen-repo-ci (ebola)	1m 0s
test (python=3.8 biopython=1.79)	7m 10s
test (python=3.8 biopython=1.80)	7m 3s
pathogen-repo-ci (lassa)	44s
test (python=3.8 biopython=latest)	7m 3s
pathogen-repo-ci (mumps)	53s
test (python=3.9 biopython=1.79)	7m 10s
pathogen-repo-ci (ncov)	1m 24s
test (python=3.9 biopython=1.80)	7m 8s
pathogen-repo-ci (rsv)	2m 26s
pathogen-repo-ci (seasonal-flu)	1m 4s
test (python=3.9 biopython=latest)	7m 1s
pathogen-repo-ci (tb)	1m 26s
test (python=3.10 biopython=1.80)	6m 55s
pathogen-repo-ci (zika)	50s
test (python=3.10 biopython=latest)	7m 5s
test (python=3.11 biopython=1.80)	7m 10s
test (python=3.11 biopython=latest)	7m 10s
build-docs / build-conda	0s
build-docs / build-pip	55s
codecov	0s
	1h 29m 14s

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