plot.balance.plots: Prints a grid of balance plots.
In TriMatch: Propensity Score Matching of Non-Binary Treatments

Prints a grid of balance plots.

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## S3 method for class 'balance.plots'
plot(x, rows, cols, byrow = TRUE,
  plot.sequence = seq_along(bplots), ...)

`x`	the results of `balance.plot` when a data frame is specified.
`rows`	if `covar` is a data frame of covariates, the number of rows in the grid of figures.
`cols`	if `covar` is a data frame of covariates, the number of columns in the grid of figures.
`byrow`	if TRUE (default), plots will be drawn by rows, otherwise by columns.
`plot.sequence`	the sequence (or subset) of plots to draw.
`...`	currently unused.