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/travel/api/TravelActionManager.php

@@ -1,19 +0,0 @@
-<?php
-class TravelActionManager extends ApproveAdminActionManager{
-
-    public function getModelClass(){
-        return "EmployeeTravelRecord";
-    }
-
-    public function getItemName(){
-        return "TravelRequest";
-    }
-
-    public function getModuleName(){
-        return "Travel Management";
-    }
-
-    public function getModuleTabUrl(){
-        return "g=modules&n=travel&m=module_Travel_Management";
-    }
-}