Added RPC method "wait" that waits for specified number of seconds. Primary use will be for regression testing, but could also be used for user scripting eventually. Probably we should later add another version such as wait_on_block that waits for a specified number of blocks as well. Also renamed  some existing wait methods used internally in the code to clarify their purpose.
adding missing file
don't adjust time if NTP query takes too long, instead try again
adding RPC call to list current round delegates
adding API calls to list blocks
Fix json missing comma, and update generated api