Allow volcano() top to accept gene names #123

Job	Run time
test (scell/rna_sc.ipynb)	2m 35s
test (bulk/rna.ipynb)	4m 6s
test (bench/rna.ipynb)	3m 8s
test (omnipath/orthologs.ipynb)	4m 42s
test (example.ipynb)	2m 9s
test (spatial/rna_visium.ipynb)	3m 13s
test (scell/rna_pstime.ipynb)	4m 24s
test (scell/rna_psbk.ipynb)	3m 10s
test (omnipath/licenses.ipynb)	1m 14s
	28m 41s

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