MetaScale/nt2 — pull request #535 by mgaunard (2013-09-04 14:51:42+00:00)
Title: Make splat automatic for all elementwise functions

This commit does 3 things:
- remove all explicit mixed scalar/simd variants for operators
- make elementwise_ call splat if at least one value is a vector and one is a scalar, and if all vector values are on the same extension
- make map work with cases like `map(multiplies_, native, int)`

The implementation could possibly be simplified, in particular I'd like a review of the vector_on_ext logic coupled with scalar_of, maybe there is something better to use.