[Freeciv-Dev] Cleanup in map.c

[Thue <thue@xxxxxxx>]

This makes sure most of the functions in map.c don't try to count 
non-existing tiles. If the rest of the code is modified the same way it will 
also make it more or less trivial to implement things like torus maps, flat 
maps and maps with real isometric grids.

There seemed to be a bug in is_terrain_clean(); fixed.

-Thue

update_map_functions.diff
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