port from mysql to mysqli extension

The vanilla mysql module in PHP has been deprecated for some time. The
warning messages about it's use are nearly militant now and I just ran
across a server that didn't even have the old module to fall back on.
This simple switch should make use of the mysqli module instead with is
the closest drop-in replacement.
remove manual over-ride of table engine

The SQL syntax here was not valid and choked newer mysql family database
servers. MariaDB for example does not take this syntax. You can use
`engine=MyISAM` instead, but I think it's really better to leave this to
the default set for the parent database as some servers are optimized
for specific storage engines.