-externalized site text

-updated to sort country list by number of deals (reverse)

depending on number of migration arcs.
- updated animation to make arcs clearer. pulses only occur for zero
length arcs, arc width is smaller, circular markers added to beginning
and ends, animated migration arrow is sized depending on zoom level.

updated to handle deep linking to countries and cases

changed ingest to support many to many buyer-seller relations

fixed a bug where internal deal countries were not highlighted.

modified map to handle new data structure
added splashscreen for longer intro text.
new styling for data items
shows full list of deals by default
filter list by country or deal name

changed so that if an arms deal appears on the sidebar, all countries involved appear, whether or not they are direct importers or exporters from the chosen country.