Remove S<l check.
Plan is to add is_standard()/is_canonical() instead of changing the current behavior
of the verification function. Suggested by CodesInChaos.
Make include guards consistent, and avoid reserved identifiers.
Constant-time sodium_bin2hex()
Original C# code by CodesInChaos.
Make sodium_bin2hex() slightly faster
Version bump
Merge branch 'master' into debian/unstable
prepare for release

Signed-off-by: Kill Your TV <killyourtv@i2pmail.org>