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Reabsed the p521 curve support on top of master #229

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Umair-Anwar
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So this is just merging two repos, where one is the origin and the other is forked but added support of the p521 curve. This forked was old and behind the origin/master. Now p521 support is rebased on origin master
Original base library: https://github.com/kmackay/micro-ecc
P521 Forked: https://github.com/microblink/micro-ecc/tree/microblink/master

- the implementation does not work for unknown reason, but gives overview
  of final performance of P-521
- details can be tracked here: kmackay#99 (comment)
- secp521r1 currently works only for uECC_OPTIMIZATION_LEVEL <= 2 and is
  around 6 times slower than secp256k1 on same optimisation level and
  around 12 time slower than secp256k1 on optimisation level 4
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