r3.1-A Fix crash on empty qps

Fix crash when qps is not specified.

r3.A "No Self-Awareness"

Experimental release for internal testing purposes.

It introduces two changes:

• added int n = 8 parameter to specify the size of the 2D DCT.
• allows you to specify all n*n factors.
• Added qp parameter to simulate DCT quantization. Thanks @WolframRhodium for implementing this feature.

It statically links libfftw3f.

r2.1A

static build with libfftw3f and includes avx/avx2 support.

No functional changes compared to upstream r2.1