Instead of saving accounts on every update when using the Yaml storage method,
accounts are saved after a configurable number of ticks after the first of
a series of updates occurs.
Updated default config file with more comments and changing options
available to YamlStorage
Added unit test checking on thread safety of Yaml balance operations
Enable bank commands only when support is enabled in the configuration
Added the bank setowner command that can be used for a player to give
an account away or by an admin/op
Made bank remove command deposit remaining balance into owner's player account
Added scale command so all player's account balances can be scaled at once
