extend docu

[floweisshardt]

• catkin run_tests with FALSE, TRUE in CMakeLists.txt
• manual testing with non-default test_generation.yaml

[fmessmer]

* [ ]  catkin run_tests with FALSE, TRUE in CMakeLists.txt

TRUE and FALSE are only relevant for catkin_run_tests

* [ ]  manual testing with non-default test_generation.yaml

non-default test_generation file needs ts* regex in addition to test_generation file name:
rosrun atf_core record_tests.py mojin_atf_manipulation_pick_place ts* atf/test_generation_config_minimal.yaml

otherwise, default is: atf/test_generation_config.yaml