Details:
- Added definitions of static functions bli_dt_domain()/bli_dt_prec(),
which extract a dom_t domain or prec_t precision value, respectively,
from a num_t datatype.
- Changed the return types of bli_obj_domain() and bli_obj_prec() from
objbits_t to dom_t and prec_t. (Not sure why they were ever set to
return objbits_t.)