add init code block option to test spec

Tst/testing_library/testlib/tools.py

Tst/tst/data_model.py

Tst/tst/generator.py

Tst/tst/generator_templates/co_header.py

Tst/tst/generator_templates/co_post_condition.py

Tst/tst/generator_templates/co_step.py

Tst/tst/generator_templates/run_header.py

Tst/tst/generator_templates/ver_header.py

Tst/tst/generator_templates/ver_step.py

Tst/tst/view.py