I updated the link tag for all php files with the new matomo link.
Not sure if it is realistic that this will get merged but I though that someday someone has to do this(?)
DuplicateActionRemover into a DAO that only deals w/ duplicate actions, created two new DAO classes (one for log_action manipulation and one for getting relational table metadata), deprecated SHOW COLUMNS method in Db in favor of new table metadata DAO, and added & fixed tests.