Added key sequence per account rather than global

This should allow recovery of which account various orders belonged to.
I also stored the key sequence number in the key record for a future
update that will enable "pre-scanning" for running wallets in parallel.
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
fix spacing
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop