Introduce secp256k1_scalar_t for future constant-time mod order operations
Merge pull request #75

a9f5c8b Introduce secp256k1_scalar_t for future constant-time mod order operations (Pieter Wuille)
Switch scalar to use get/set 32-byte arrays
Add unit tests for scalars.

Also add a secp256k1_scalar_is_one function.
Merge pull request #76

7935930 Add unit tests for scalars. (Pieter Wuille)
eca6cdb Switch scalar to use get/set 32-byte arrays (Pieter Wuille)
Add bench_inv tool
Remove OpenSSL bignum implementation
Merge pull request #78

520ba3c Remove OpenSSL bignum implementation (Pieter Wuille)
Merge pull request #79

ae2679b Add bench_inv tool (Pieter Wuille)
Make bench deterministic
Rename bench to bench_verify
Merge pull request #80

504c63d Rename bench to bench_verify (Pieter Wuille)
01097dd Make bench deterministic (Pieter Wuille)
Fix build for 64bit field under OSX

- caused by https://github.com/bitcoin/secp256k1/commit/8881212ebc43e67052ec06dec8beb459769fbab7
- OSX's ar tool doesn't work for empty archives ("ar: no archive members specified")
- repaired by moving entire commit under USE_ASM