Added support for annotation of the rows with binary categorical variables. Each column is a category, the annotations are black/white squares indicating whether the row is positive/negative for that category. The categories are labelled below the annotations. The width of the column labels considers the additional category names when generating the layout.
Update DESCRIPTION and NEWS to reflect row annotation support.
Updated documentation to reflect row annotation support.
Fixed some package check errors related to brewer.pal not being imported.