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
Remove web_wallet submodule
Rename qt_wallet
Fix build, mostly