Merge pull request #206 from ParagonDevelopmentTeam/sync

Sync
Base city size on population rather than planet size
Add yellow spikes for millions, green still for billions
Planet population is now shown in systeminfoview
Add GetPop() to fetch planet population
Fix Pioneer bug which places all towns along one axis, small rocks and non atmosphere planets have very little population, BAse number of starports by population
bah a space..
cleanup