Real load balance

I've verified that the following cases work:

   * Normal power migrations with multiple supply / demand nodes
   * Changes in generation and load at runtime affect power migrations
   * Group reconfigurations due to FIDs or otherwise affect load balance
   * The invariant check is skipped unless its associated flag is enabled
   * The malicious behavior flag produces the same results as fake adapters

I also updated the sample configuration files and verified that all of them work.