Fix regression test simulated time

It was setting the simulated time to be before the genesis. That's bad.
Now it' initializes the time to after the genesis.
Fix is_unique_account wrt updated active key

Previously a wallet account was considered different from its blockchain
counterpart if the active key had been updated. This is no longer the
case.
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop