Add TRACE log level

This is useful for when we want important debug messages, but not
necessarily to be flooded with every message that comes through IRC

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

omnibot/config.py

@@ -82,7 +82,7 @@ class ServerConfig:
         if "loglevel" in obj:
             if not isinstance(obj["loglevel"], str):
                 raise ConfigError("loglevel", "must be a string")
-            loglevels = ["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
+            loglevels = ["TRACE", "DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"]
             if obj["loglevel"] not in loglevels:
                 raise ConfigError("loglevel", "must be one of: " + " ".join(loglevels))
             self.loglevel = obj["loglevel"]