make_qmat: Create association pattern matrix
In kjgleason/primo: Package in R for Integrative Multi-Omics association analysis

Make matrix denoting association patterns (Q) that indicates null/alternative densities in the association patterns.

1	make_qmat(grp, name_cols = FALSE)

`grp`	vector of group/study identifiers (common to use `seq(1,d)`, for d groups/studies).
`name_cols`	logical indicating whether to name columns using group/study identifiers.

A matrix with all binary combinations of the groups. The value in row k and column j denotes whether statistics from study j come from the null (0) or alternative (1) distribution under the k-th association pattern.