Release candidate 1.8-RC4

Here is the fourth and final release candidate for Michael 1.8. It adds the ability to use MySQL instead of the embedded HSQL database. MySQL is not activate as the default database in th sources. To activate it you have to modify three files:
1) pub-mpf/application.xconf
Uncomment the element "<sdx:database type="MYSQL" dsi="mpf"/>"

2) WEB-INF/cocoon.xconf
Replace the right values for MySQL connexion (user, password, database name, port, etc.). See the element <jdbc name="mpf">.

3) WEB-INF/web.xml
Uncomment the declaration of MySQL JDBC connector (org.gjt.mm.mysql.Driver) and comment the HSQL JDBC connector (org.hsqldb.jdbcDriver).

If you activate this with an existing MPF instance, you must delete the directories in "pub-mpf/conf" : databases, dbs, dcollection, institution, pcollection, projet, service, thesauri, users. After that restart the application and re-index all the files!