Add differential time for account history

Account page currently shows the following columns: Block, Transaction, Operation and Content. A moment when transaction happened can be presented in three ways: block number (that is what we have now), block timestamp or how long ago block happened (differential time). Out of those three ways the last one carries most immediately useful information, primarily because it is easy to see at first glance if anything new happened on the account. hiveblocks.com presents that differential time, with timestamp on a tooltip and block only in form of link to block.

Either add differential time in new column, or replace Block column with it (adding block timestamp and possibly block number on a tooltip).