Version 1.6
    
    - Apply various specfile cleanups from Fedora.
    - request-key: Provide a command line option to suppress helper execution.
    - request-key: Find least-wildcard match rather than first match.
    - Remove the dependency on MIT Kerberos.
    - Fix some error messages
    - keyctl_dh_compute.3: Suggest /proc/crypto for list of available hashes.
    - Fix doc and comment typos.
    - Add public key ops for encrypt, decrypt, sign and verify (needs linux-4.20).
    - Add pkg-config support for finding libkeyutils.