everything will require product-names.csv now

1. For each of the menu items 1 to 6, accept a product-names.csv file
(instead of a single product name and dates as in the current
implementation) and generate the respective output for all products in
that file.

2. For item 1, generate the Pajek file as well as the corresponding
nw-metrics.csv.

3. For item 8, in the developer model, do not generate the
nw-metrics.csv. for each product.