Upgrading The Planet's Citadel:

To upgrade a planet to various levels of citadel defense requires
colonists and products. Please note that it is not necessary to 
leave the colonists on the planet while waiting for the 
construction to be completed. You can trigger the construction, 
and immediately move the colonists to another planet. One handy 
thing to know about the MBBS version of TW, is that even though 
it takes 1 turn to move a load of colonists from one planet to 
another, but if you are already out of turns you can still move 
them at no turns!

Here's a chart of the products and colonists needed for each of the
useful planet types:

                   Mountainous Type:

Level   Cols    Ore     Org     Equip   Days    Total Days
----------------------------------------------------------
  1      400     150     100     150      2        2
  2     1400     200      50     250      5        7
  3     3600     600     250     700      5       12
  4     5600    1000    1200    1000      8       20
  5     7000     300     400    1000      5       25
  6     5600    1000    1200    2000     12       37


                   Oceanic Type:

Level   Cols    Ore     Org     Equip   Days    Total Days
----------------------------------------------------------
  1     1400     500     200     400      6        6
  2     2400     200      50     300      6       11
  3     4400     600     400     650      8       19
  4     7000     700     900     800      5       24
  5     8000     300     400    1000      4       28
  6     7000     700     900    1600      8       36


                   Volcanic Type:

Level   Cols    Ore     Org     Equip   Days    Total Days
----------------------------------------------------------
  1      800     500     300     600      4        4
  2     1600     300     100     400      5        9
  3     4400    1200     400    1500      8       17
  4     7000    2000    2000    2500     12       29
  5    10000    3000    1200    2000      5       34
  6     7000    2000    2000    5000     18       52


                   Earth Type:

Level   Cols    Ore     Org     Equip   Days    Total Days
----------------------------------------------------------
  1     1000     300     200     250      4        4
  2     2000     200      50     250      4        8
  3     4000     500     250     500      5       13
  4     6000    1000    1200    1000     10       23
  5     6000     300     400    1000      5       28
  6     6000    1000    1200    2000     15       43
