we might want to change from utf8 to utf8mb4 for mysql installation instructions and frontend - see https://mathiasbynens.be/notes/mysql-utf8mb4
include/db.inc.php: DBexecute('SET NAMES utf8');
mysql database upgrade fails, 4.0 - 4.2. Specified key was too long; max key length is 767 bytes
Four byte UTF-8 symbol causes "query failed:  Incorrect string value"