20161230

sql delete replaced by delete flag
log list (simple), log categories
minor bug fixes in css

_include/include_lock_training.php

@@ -15,6 +15,7 @@ if ($this->is_id()) {
 			'tr_id' => $this->get_id()
 		)
 	);
+	log::register(($locked?'training_open':'training_close'), $this->get_id());
 	header('Location: /admin/presence/' . $this->get_id());
 }