1) Supports Intel's new for fused multiply add instruction introduced with the Haswell CPU.
This results in faster FFTs. Note that performance on many Haswell systems is memory-bandwidth
limited. This means that when running workers on all cores performance gains will be small.
2) Some minor optimizations may give a very small performance boost for AVX CPUs.
3) All new test torture test data for AVX CPUs. The new data runs more interations, thus more time
is spent torturing the CPU rather than initializing the FFT routines.
4) Information added to result lines containing "has a factor". This information may be used
by the server's manual web page to give proper TF / P-1 / ECM cpu credit at a future date.
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