Clarify, extend, and rename ky*.py to kicad_netlist_reader.py.

Significantly enhance the bom_csv_grouped_by_value.py BOM generator.
IMO it at this moment, the best BOM production tool for KiCad.

scripts/bom-in-python/bom_csv_by_ref.py

@@ -4,21 +4,23 @@
 # Example: Tab delimited list (The same as std output) Ungrouped
 #
 
+from __future__ import print_function
+
 # Import the KiCad python helper module and the csv formatter
-import ky_generic_netlist_reader
+import kicad_netlist_reader
 import csv
 import sys
 
 # Generate an instance of a generic netlist, and load the netlist tree from
 # the command line option. If the file doesn't exist, execution will stop
-net = ky_generic_netlist_reader.netlist(sys.argv[1])
+net = kicad_netlist_reader.netlist(sys.argv[1])
 
 # Open a file to write to, if the file cannot be opened output to stdout
 # instead
 try:
     f = open(sys.argv[2], 'w')
 except IOError:
-    print >> sys.stderr, __file__, ":", e
+    print(__file__, ":", e, file=sys.stderr)
     f = stdout
 
 # Create a new csv writer object to use as the output formatter, although we
@@ -32,7 +34,9 @@ out.writerow(['Tool:', net.getTool()])
 out.writerow(['Component Count:', len(net.components)])
 out.writerow(['Ref', 'Value', 'Part', 'Documentation', 'Description', 'Vendor'])
 
+components = net.getInterestingComponents()
+
 # Output all of the component information
-for c in net.components:
-    out.writerow([c.getRef(), c.getValue(), c.getLib() + "/" + c.getPart(),
+for c in components:
+    out.writerow([c.getRef(), c.getValue(), c.getLibName() + ":" + c.getPartName(),
         c.getDatasheet(), c.getDescription(), c.getField("Vendor")])