sb2b is now an alias of if_one_else_zero
the code of pow now include the powi code
pow unit tests include powi ones
pow bench tests include powi ones
pow cover tests include powi ones
spurious include sb2b.hpp remaining in complex inbtrue
suppressing remaining includes ../powi.hpp
removing powi.* files
suppressing powi.cpp from Cmakelists
still some calls to powi replaced by calls to pow
Merge branch 'issue_427' of github.com:MetaScale/nt2
Merge branch 'issue_428' of github.com:MetaScale/nt2