Make the num module optional #119

1. 
   sipa commented at 0:31 am on November 28, 2014: contributor

   Build on top of #117, and makes num optional entirely.

   Having num (with one implementation: GMP) available means faster field and scalar inverses, and is required for the endomorphism optimization.

   Benchmarks (with –with-field=64bit_asm) for verification:

   • –with-num=gmp –enable-endomorphism: 253k cycles
   • –with-num=gmp –disable-endomorphism: 345k cycles
   • –with-num=none –disable-endomorphism: 432k cycles

   (secp256k1 in OpenSSL needs 1523k cycles, Ed25519 needs 231k cycles)

2. sipa cross-referenced this on Nov 28, 2014 from issue Avoid field inverse for r == x comparison by sipa
3. sipa force-pushed on Nov 30, 2014
4. sipa force-pushed on Nov 30, 2014
5. sipa force-pushed on Nov 30, 2014
6. 
   sipa commented at 10:51 pm on November 30, 2014: contributor

   @theuni Care to review the build changes here (last commit only)?
7. sipa force-pushed on Dec 1, 2014
8. Make constant initializers independent from num 659b554d7b
9. Make num optional 597128d389
10. sipa force-pushed on Dec 1, 2014
11. 
    gmaxwell commented at 2:28 pm on December 2, 2014: contributor

    ACK
12. sipa merged this on Dec 2, 2014
13. sipa closed this on Dec 2, 2014

    ---

14. sipa referenced this in commit bd313f7d6e on Dec 2, 2014
15. sipa cross-referenced this on Dec 2, 2014 from issue unable to configure on Ubuntu 14.04 by gdassori

Contributors
sipa gmaxwell