Fixed unit tests

Fixed unit tests

 - removed some garbage unit tests

 - fixed some broken unit tests

 - added some new tests for FriendLocationItem

 - test script modifications

      * check if unit test file is executable

      * doesn't try to test master tests.pro project

      * added some instructional prints if executables
        for all unit tests are not found

      * check if test report contains any qDebug or
        qWarning prints and instruct to disable them