it leverages the recently added wstat support

Print the time (HH:MM) of the last edit is within the last 6 months, the year otherwise; match what `ls -lahF' does on OpenBSD, and I think it's cool.

Also skip the progression bar if hexdump is enabled.

...otherwise nfid is not valid and do_clunk aborts.

refactor the "write or create file" code into a function (woc_file) to share it with the `put' command.