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 (!)