#31 Sanity check for too much minerals

[Maurits van Rees]

We could check for planets that have enough minerals
and megacredits to build a starbase but no starbase in
orbit and no starbase ordered.

Also maybe check for non-starbase planets with more
than say 800 kt of minerals or more than 10000
supplies+megacredits. The user should be able to
specify those numbers. This is probably better
expressed as a report option in a player command file.