fast_hypot is generic and as simple as possible
correcting hypot implementation and adding tests
adding tests to hypot and modyfing complex abs to use hypot
2 bad or missing includes and an unneeded define
adding simd exhaustive test for hypot
still some includes problems in fast_/hypot
missing # in include
Merge pull request #659 from jtlap/fixing_hypot

Fixing hypot
new scripts to create benchmarks
updated README for benchmark scripts
typo fixed
extra white space cleaned