Fix printing of public data in blockchain_get_account_record{,_by_id}

Previously the public data was only printed if the meta data was
defined, which makes no sense. Now the public data is printed if the
public data is defined.
Include block production ratio in delegate account record printout

In addition to printing the blocks produced and the blocks missed, the
printout for delegate account records now includes a block production
ratio calculated as (produced/(produced + missed))
Merge branch 'master' of github.com:BitShares/bitshares_toolkit