Permissions on user targets and modul user targets

This modification would add the global permissions on user targets as follows:

● show all user targets
● show own user targets

Why it is necessary: The user targets in Sales department couldn´t be visible to others. Now it is possible to set the dynamic generic gauge on users homepage and to choose the user target of someone else. It´s quite crucial, because the user targets for sales representatives are directly connected to the wage of the users. Therefore, the user target is secret information for others.