The dumpdb and loaddb commands have reached their limit in terms of

usefulness. While they could be helpful in limited situations, they

won't be compatible with Review Board 4.0+, primarily because the data

generated (by Django) won't at all be compatible with Django > 1.6.
In practice, there have always been issues with dumping data on one

version of Review Board and loading it on another, due to the

possibilities of database schema changes, which these tools cannot

address. Because of this, along with other hard-to-solve problems that

manifested under Review Board 4.0, we're going to be removing these

tools entirely, suggesting that people instead use the database's native

tools for moving databases.
Power Pack will soon be providing a more future-proof way of handling

database dumps, so we have a successor coming soon.
This change marks these tools as deprecated in the help output, and

explains the situation when running either tool.

Ran both commands, ensuring they work and display the appropriate notice.