[vector] Why is it `FloatSpecies.zero()` and `FloatSpecies.broadcast()` but `FloatArray.fromArray()`?

[Lev Serebryakov]

 I, as early adopter of Vector API, was very surprised by inconsistency
of fabric methods for vectors.

 Some of these methods are methods of "Spices" (`zero()`, `scalar()`,
`random()` and `broadcast()`) and some of these methods (all
`*fromArray()`) are class-methods of "Vector" and takes "Spices" as
argument.

 Is here any rationale behind this inconsistency?

-- 
// Black Lion AKA Lev Serebryakov