Re-write secp256k1_fe_sqrt and secp256k1_fe_inv to use a sliding window over blocks of 1s
Fix addition chain entry in comments
Merge pull request #19

bb7bb81 Fix addition chain entry in comments (Peter Dettman)
f8ccd9b Re-write secp256k1_fe_sqrt and secp256k1_fe_inv to use a sliding window over blocks of 1s (Peter Dettman)