A little paving for mail-based transaction notifications
Implement transaction notification via mail
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Fix all cover interest calculation handling
Fix logic circa delegate pay changes
List mail servers if failed to send message
Mark manual cover transactions as market transactions
Rework mail server resolution

Now users publish mail servers as a list of account names. Each of these
account names will be looked up when sending mail, to get its published
IP endpoint for the RPC server.
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Restore saving one-time-key in wallet::mail_encrypt()
Fix transfers to unregistered accounts
Add missing #include

pending_chain_state.hpp uses reflection, but didn't include reflect.hpp causing a compile error if it was not already included by some other file.
Merge branch 'develop' into keygen

Conflicts:
	libraries/wallet/wallet.cpp
Fix build after merge
Add wallet_db::repair_records for future use in BTS