* Fix a bug in the version check to support major version > 2 (neo).
Patch from https://github.com/wwest4
* Give ykpamcfg an option for specifying path.
* Only use libyubikey when --with-cr is used.
* Set correct permissions on tempfile.
* YubiKey 2.2 contains a bug in challenge-response that makes it output the
same response to all challenges unless HMAC_LT64 is set. Add warnings to
ykpamcfg and a warning through conversate in the pam module. Keys programmed
like this should be reprogrammed with the HMAC_LT64 flag set.