(string database, string query, int link_identifier);
Returns a positive mSQL query identifier to the query result, or
false on error.
msql() selects a database and executes a query
on it. If the optional link identifier isn't specified, the
function will try to find an open link to the mSQL server and if
no such link is found it'll try to create one as if
msql_connect() was called with no arguments