Usage:
$smcFunc['db_remove_column'](table_name, column_name, parameters, error)
Description: This function removes a column.
Parameters:
- table_name (string) the name of an existing table
- column_name (string) the name of the column that should be removed.
- parameters (array) deprecated as of 2.0 RC3, leave empty
- error (string) deprecated, leave empty
Return: (bool) true if the column is successfully removed, false otherwise.