This function will create a txtSQL table with the name $tablename, as long as it does not already exist. The columns that will be in this table will be defined in $columns part of the array. $columns must be an array in the following format
array([$columnName => array([$coltype => $value]...)]... )
For more information on on column types, see the column types section
Important- To achieve the same results as this function before txtSQL 2.2.2 RC2, use the execute() function
Note- If $tablename already exists, txtSQL will issue an error
Note- If no $db is specified and no database is already selected, txtSQL will issue an error
