Debug messages

Debug messages will be stored per-session, based on CONNECTION_ID().

Users will be able to log debug messages using write:
void write(msg TEXT)

If the auto_messages option is on, automatic messages will be triggered by DBUG - for example, when a checkpoint is found.

To read messages:
* TEXT msg_first() (not necessary first time, or when msg_eof() returns TRUE)
* TEXT msg_next()
* BOOL msg_eof()
* SMALLINT UNSIGNED msg_count()
* VOID msg_clean() - only works with your messages
* VOID msg_purge() - delete all

Table:
messages

View:
my_messages