annotateModule: Annotate a network module with information
In rTRM: Identification of transcriptional regulatory modules from PPI networks

Uses information about expression, enrichment and parent PPI network to annotate a subgraph.

1	annotateModule(g, enrich, trm, targets, ppi, exprs, tfs)

`g`	graph to annotate in igraph format.
`enrich`	list of enriched transcription factors (or motifs).
`trm`	TRM to compare with (to identify bridges).
`targets`	list of target transcription factors (typically those with ChIP-seq data).
`ppi`	parent PPI network (to check membership of nodes).
`exprs`	list of entrezgene ids representing expressed genes.
`tfs`