Adventurer tweak

The "anywhere" options for adventurers picking a new court now have
range limits so adventurers from the Maldives should probably not end up
in Brittany (as often).
de jure tweaks for Millenium start

Also noteworthy: do we want Khazaria as a 1-duchy kingdom in 1000? Do we
want k_sami to have 2 non-contiguous duchies post-1000?