Bug fix: sort on field 1

The correct syntax to sort on field 1 is `--key=1,1`. `--key=1` used
as key from field 1 to the end of the line. So the key was non-numeric.

Overlap/eddy_graph_in.sh

@@ -26,7 +26,7 @@ done
 
 # Sort the edge list for easier comparison between runs:
 export LC_NUMERIC=C # for the sort command
-sort --key=1 --numeric-sort --output=edgelist.csv edgelist_unsorted.csv
+sort --key=1,1 --numeric-sort --output=edgelist.csv edgelist_unsorted.csv
 rm edgelist_unsorted.csv
 
 echo "Created files \"edgelist.csv\", \"isolated_nodes.txt\" and " \