Make constant initializers independent from num
Make num optional
Add a test for r >= order signature handling

Suggested by Greg Maxwell.
Add a test case for ECDSA recomputing infinity
Merge pull request #126

24b3c65 Add a test case for ECDSA recomputing infinity (Pieter Wuille)
32600e5 Add a test for r >= order signature handling (Pieter Wuille)
Merge pull request #124

4d4eeea Make secp256k1_fe_mul_inner use the r != property (Pieter Wuille)
be82e92 Require that r and b are different for field multiplication. (Pieter Wuille)
Merge pull request #119

597128d Make num optional (Pieter Wuille)
659b554 Make constant initializers independent from num (Pieter Wuille)
Bugfix: b is restricted, not r
Merge pull request #129

35399e0 Bugfix: b is restricted, not r (Pieter Wuille)
Rewrite field assembly to match the C version