Add tool for changing/reading file timestamps
Add tool for changing/reading file timestamps

I find the "[[CC]YY]MMDDhhmm[.SS]" syntax of Unix's touch tool to be too
cumbersome, preferring to pass a Unix-style timestamp intead. Similarly,
I don't get much joy from using `stat -f %m $FILE` each time I'd like to
parse a file's modification time in a POSIX-friendly fashion.

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