new $economy object testing 6/17/13

Currently Wayfar uses an $economy object to track transactions on each planet.  This is handy for calculating NPC buy orders or adjusting the (totally unfair) pricing on NPC provided items.  As it is, these economies actually hold and track real item objects.  I've written new methods to abstract this in order to save memory.  Testing continues!

* Wayfar server RAM has been upgraded to 2GB in order to host more systems and the upcoming graphical client