(For 4.1 tables old 'VARCHAR' fields are converted to true VARCHAR in the next ALTER TABLE)
This ensures that one can use MySQL 5.0 privilege tables with MySQL 4.1
Set default max_allowed_packet to be able to read help tables even if an my.cnf file with this option is present. (Bug #3938)
Don't use default arguments for ha_rnd_init()
Simple code cleanups since last pull