plotEQTL: Make a boxplot of expression QTL in multiple conditions.
In kauralasoo/seqUtils:

Plots are faceted by condition_name column in sample_metadata.

1 2	plotEQTL(selected_gene_id, genotype_id, expression_matrix, genotype_matrix, sample_metadata, gene_metadata)

`selected_gene_id`	ID if the gene of interest.
`expression_matrix`	Matrix of normalised gene expression values (genes in rows, samples in columns). Column names correspond to sample_id in sample_metadata.
`genotype_matrix`	Matrix of genotypes (variants in rows, individuals in columns). Column names correspond to genotype_id in sample_metadata.
`sample_metadata`	data frame linking samples to genotypes (Required columns: sample_id, genotype_id, condition_name)
`gene_metadata`	data frame for linking gene ids to gene names. (Required columns: gene_id, gene_name)
`gentype_id`	ID of the variant of interest.