Improve error message: inconsistent coordinates

DESCRIPTION

 Package: mapMCDA
 Title: Produce an epidemiological risk map by weighting multiple risk
         factors
-Version: 0.4.4
+Version: 0.4.5
 Date: 2019-04-11
 Authors@R: c( person("Andrea", "Apolloni", email =
         "andrea.apolloni@cirad.fr", role = c("ctb"), comment = "Animal

R/network.R

@@ -146,8 +146,9 @@ must be respected:",
   
   ## Check consistency of coordinates
   if (any((idx <- tapply(v_coord$Node, v_coord$Node, length)) > 1)) {
-    idx.nodes <- names(idx)[idx > 1]
-    stop("Node(s) ", idx.nodes, " have inconsistent coordinates in the dataset.")
+    idx.nodes <- paste(names(idx)[idx > 1], collapse = ", ")
+    stop("Inconsistent coordinates.\n",
+         "The file specifies different coordinates in different lines for node(s): ", idx.nodes)
   }
   
   ans <- geonetwork::geonetwork(e_list, v_coord, directed = TRUE)