Remove rest of deprecated messages getAccount, getInbox and getOutbox.

Addendum to commit ca29cff.
Merge pull request #422 from benma/remove_deprecated

Remove rest of deprecated messages getAccount, getInbox and getOutbox.
Removed TransportCallback.
Removed unused TransportFunction.
Rewired stuff for calling the logic behind the removed callback function.
Fixed broken sends in opentxs-script.