1) *_run.py more explicit on how to set domains
2) New domain, TUPLE_TEMPLATED_CTOR, which is flag
indicating whether bcon12* tuples have templated
CTOR's taking args for tuple elements.
3) *.run.txt using new domain, and still shows
clang better at horizontal than vertical implementation.
4) Missing: changes in tuple_impl.bcon12*.hpp.
Don't (yet) know why.