queue up as many of the cheapest, largest units you can buy (akontisti at 120 men a unit?) and then use the 'process_rq Sidon' cheat to build them all at once. Ship them to somewhere else and disband them. Hey presto - instant colonists! With a queue of 10 units, thats 1200 'colonists' a turn, or more if you use giant unit settings. Of course you can only use the cheat once each time you load the game, so you may need to reload a few times before you have a low enough population...