[Freeciv-Dev] (PR#9918) create a pleced map and rename map_temperature has map_lattitude

["Jason Short" <jdorje@xxxxxxxxxxxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=9918 >

You've got at least two different changes in here.

temperature => lattitude
T_NOT_PLACED => placed_map

also there's no need for a remove_placed_map.  Rename create_placed_map
as init_place_map and use realloc instead of malloc in it.

However having the placed map be global is dangerous.  You want it to
have multiple users: for hut placement, terrain placement, etc.  But
what if these users overlap?  The terrain placement code could end up
looking to see if a special has been placed yet on a tile.

jason