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
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.
[GS] Update regression tests
Merge branch 'develop' of https://github.com/BitShares/bitshares_toolkit into develop
[GS] Update regression tests
[Urgent] Resolve #864

A pointer was being dereferenced without checking if it was valid. I'm
not sure how this never created an issue on the testnet...
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop