strings(1)

Implemented unicode-compliant strings(1) based on the current Plan 9 implementation.  Added a single new flag, -o, which turns on file offset printing.  In Plan 9 this is the default and cannot be changed; here the opposite is true.

Comparing output between P9Port's strings and this shows interesting discrepancies; Go's unicode.IsPrint / .IsGraphic works differently than the P9 strings's function of the same name, and appears to be more lenient.