#31 symv optimization

[R. Clint Whaley]

Have extra tuning step in Level 2, where we tune a
NoTrans GEMV specifically to match the Trans gemv;
assume we call trans gemv first, then it's in-L1
for NoTrans (no need for prefetch), but you'll want an
axpy-based algorithm . . .

[R. Clint Whaley]

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This is done. Will be in next developer release.