updates to countries and coalitions

countries and coalitions are the file names in the campaign db, but
these retain their original rof_countries/bos_countries
rof_coalitions/bos_coalitions in the central db as sources... much as
I've done before with object_properties.

I've tested that campaign creation, log parsing and display of aircraft
and vehicles still work... but I didn't test *everything*.  Let me know
if there is a problem.