[Freeciv-Dev] Slight fog of war update

[Thue Janus Kristensen <thue.kristensen@xxxxxxxxxx>]

Removed a text cut and paste error.Added debug messages.
Moved map functions that should only be used by the server from common/map to
server/maphand (functions that operate on the known bitvector is in commom/map
in current CVS)
Explained the fog of war implementation in freeciv-hackers-guide.txt , in
effect rewrote the map section.

I observed some AI's play 2 full games, but failed to find any bugs. Getting
close...

-Thue

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