Changes in version 1.13.1                        

    o   Node labels were ignoring the 'cex' node data value (reported
	by Hannes Hettling)

    o   Added "start" and "both" options for "arrowLoc" graph attribute
	(which will draw arrowhead at both ends of hyper edges)

    o   Bug fix for converting Hypergraph to graphBPH so that hyperedge
	names are used as edge labels (reported by Hannes Hettling)

    o   Update the R version check in drawEdge() to cope properly with
	major versions greater than 2 (!)