fixed documentation for plotHeatmapActivity
fixed legend label of summary.logFC in plotBubble
removed duplicate genes from plotHeatmapRegulon
plotHeatmapRegulongetSigGenesfindDifferentialActivityregulonEnrich function required at least 3 target genes for a transcription factor to perform geneset enrichment test. Now additional constraint is imposed such that we require at least 3 genes to be present in the geneset.