* Modified the empire resources update to check for vacation mode and
apply the modifier from vacation.cashDivider if necessary.
* Some parts of the database need to be reloaded:
-> 050-updates/015-empire-resources.sql
* Added a new update that computes the amount of resources possessed and
owed by empires. At the moment this computation ignores fleets, as their
upkeep does not use the resource system.
