Remove routing table migration code.
Use a helper method in go_account_stats.
Better mechanism for checking validity of replies in http_api.
Clean up some leftover hackery in http_api.
Give dialogue states a bit more space
Merge branch 'feature/issue-592-clean-up-message-store-sillies' into develop
Merge branch 'develop' into develop-frontend
Merge branch 'develop-frontend' into feature/issue-593-dialogue-states-are-too-close-together
Merge branch 'develop-frontend' into feature/issue-594-allow-connected-dialogue-states-to-be-moveable