Release note v16.0

------------------
### Features
 * Advanced Employee Management Module is now included in IceHrm Open Source Edition
 * LDAP Module which was only available in IceHrm Enterprise is now included in open source also
 * Initial implementation of icehrm REST Api for reading employee details
 * Improvements to data filtering
 * Multiple tabs for settings module
 * Overtime reports - now its possible to calculate overtime for employees.compatible with US overtime rules
 * Logout the user if tried accessing an unauthorized module
 * Setting for updating module names

### Fixes
 * Fix issue: classes should be loaded even the module is disabled
 * Deleting the only Admin user is not allowed
 * Fixes for handling non UTF-8
 * Fix for non-mandatory select boxes are shown as mandatory

ext/admin/fieldnames/api/FieldnamesAdminManager.php

@@ -0,0 +1,57 @@
+<?php
+if (!class_exists('FieldnamesAdminManager')) {
+    class FieldnamesAdminManager extends AbstractModuleManager{
+        public function initializeUserClasses(){
+
+        }
+
+        public function initializeFieldMappings(){
+
+        }
+
+        public function initializeDatabaseErrorMappings(){
+
+        }
+
+        public function setupModuleClassDefinitions(){
+            $this->addModelClass('FieldNameMapping');
+            $this->addModelClass('CustomField');
+        }
+    }
+}
+
+if (!class_exists('FieldNameMapping')) {
+    class FieldNameMapping extends ICEHRM_Record {
+        var $_table = 'FieldNameMappings';
+
+        public function getAdminAccess(){
+            return array("get","element","save","delete");
+        }
+
+        public function getUserAccess(){
+            return array();
+        }
+
+        public function getAnonymousAccess(){
+            return array("get","element");
+        }
+    }
+}
+
+if (!class_exists('CustomField')) {
+	class CustomField extends ICEHRM_Record {
+		var $_table = 'CustomFields';
+
+		public function getAdminAccess(){
+			return array("get","element","save","delete");
+		}
+
+		public function getUserAccess(){
+			return array();
+		}
+
+		public function getAnonymousAccess(){
+			return array("get","element");
+		}
+	}
+}