MFH (r252375): remove useless side effect which triggers a clang bug.
MFH (r249479): OPENPAM_DEBUG enables debugging but does not turn it on
MFH (r249479): OPENPAM_DEBUG enables debugging but does not turn it on
MFH (r250056,r250057): add -Z option to zero unused blocks.
MFH (r250736): add -N option to list jail name instead of number
MFH (r252556): allow setting expiry to current date / time
MFH (r252688): fall back to sha512 if passwd_format is not set