Updated to upstream CVS sources as of 2014.04.07

Major changes include:

- OpenSSL is no longer required. The SHA functions from the OpenBSD libc are
  now imported in the repository and used.
- Signify can now verify sets of files in a single go.
- Quiet mode can be enabled with the "-q" flag.
- Signing code can be left out by adding -DVERIFY_ONLY=1 to the compiler
  flags.