plotGeneBar: barplot of each VDJ gene usages
In xizhihui/BTCR: Simple Stats and Plots for BCR and TCR

barplot of each VDJ gene usages

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plotGeneBar(btcr, group, sample = "sample", gene = c("v", "j", "c"),
  dtype = c("percentage", "count"), isoform = TRUE, combine = TRUE,
  rotate = TRUE, ncol = 1)

`btcr`	A BTCR object.
`group`	Column in btcr$contigs to group each VDJ genes, always be sample or group.
`sample`	The sample column in btcr$contigs.
`gene`	Plot v_gene, j_gene or c_gene.
`dtype`	Plot barcode usage counts or percentages.
`isoform`	If set TRUE, plot the gene isoforms like TRAV-xxx. Or just plot the main gene like TRA, TRB (isoforms are summed.).
`combine`	Wrap plots togother. Or return the plot list.
`rotate`	Rotate the x labels.
`ncol`	When plot isoform, plot ncol in the layout.