This commit improves error handling in Flodgatt's main request-response loop, including the portions of that loop that were revised in #128.
This nearly completes the addition of more explicit error handling, but there will be a smaller part 3 to bring the handling of configuration/Postgres errors into conformity with the style here.
* Initial work to support structured errors
* WIP error handling and RedisConn refactor
* WIP for error handling refactor
* Finish substantive work for Redis error handling
* Apply clippy lints
This very minor change moves tests from their current location in
submodules within the file under test into submodules in separate
files. This is a slight deviation from the normal Rust convention
(though only very slight, since the module structure remains the
same). However, it is justified here since the tests are fairly
verbose and including them in the same file was a bit unwieldy.
Daniel Sockwell