Optimized Mining Location

[BryceAgent]

Create a function so that the quai-manager will mine in an optimized location automatically. It will do this by every 10 minutes reading the difficulty of the latest verified block in each chain and setting as its mining location whichever chain has the lowest current difficulty. This should lead to miners automatically optimizing by distributing themselves across chains efficiently.

This can be done by adding an argument "optimized" to make run-mine (or else a new makefile command) instead of selecting region and zone locations. When "optimized" is selected, a go func will execute on start up and every 10 minutes from then on to observe the latest block difficulty in each chain, and the fields of orderedBlockClients will be changed accordingly to reflect current mining location.

Switches by the manager from one location to the other should be recorded, either in the log or in a print out.