membershipTable: Create a gene set membership table.
Description
Creates a table showing which significant genes belong to which significant
gene sets. This table allows to investigate the results of a SetRank
analysis in more detail.
A matrix of boolean values. The rownames are the geneIDs, the
column names are the gene set IDs. A TRUE value in a cell indicates
that the gene of the row is present in the gene set of the column;
FALSE means otherwise.