formatMatrix: Format a matrix and add index column.
In OpenRepGrid: Tools to analyse repertory grid data

Format a matrix and add index column.

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formatMatrix(x, rnames=rownames(x), pre.index=c(T, F),
    cnames=seq_len(ncol(x)), indexcol=F, digits=2, diag=F,
    mode=1)

`x`	A matrix onbject.
`rnames`	Row names.
`cnames`	Column names.
`pre.index`	Whether to make index prefix for rows and column names.
`indexcol`	Whether to make an index column.
`diag`	Whether to show diagonal.
`mode`	Whether to show upper (mode=1), lower (mode=2) or both triangles (mode=0) of the matrix.