renamed files and added directory for grid tests

binarycpython/tests/c_bindings/__init__.py

binarycpython/tests/c_bindings/test_custom_logging_code.py

binarycpython/tests/c_bindings/test_ensemble.py

binarycpython/tests/c_bindings/test_return_store_memaddr.py

binarycpython/tests/c_bindings/test_run_system.py

binarycpython/tests/grid/__init__.py

binarycpython/tests/grid/test_grid.py