More tests for DEBUG target.
Merge pull request #151 from claudioandre/unstable-jumbo

More tests for DEBUG target on sha512crypt.
gpg-opencl cosmetical fix.
Make it safe to call clear_keys() for --stdout
Merge branch 'unstable-jumbo' into bleeding-jumbo

# By magnum (2) and Claudio André (1)
* unstable-jumbo:
  Make it safe to call clear_keys() for --stdout
  gpg-opencl cosmetical fix.
  More tests for DEBUG target.