Merge branch 'Rcode' into 'master'

defau;t color of network_to_gpml changed to black

See merge request !64

R/converters.R

@@ -309,7 +309,7 @@ network_to_gpml <- function(source_table, node_attributes = NULL, expansion_coef
     source_table <- cbind(source_table, thickness = "1.0")
   }
   if(!("color" %in% names(source_table))) {
-    source_table <- cbind(source_table, color = "ff0000")
+    source_table <- cbind(source_table, color = "000000")
   }
 
   ### Create an igraph from the network