bug#17868: 3 maint/doc patches

[Jim Meyering]

FYI: I've just pushed these:

      maint: generate distributed THANKS from VC'd THANKS.in
      doc: update HACKING
      maint: split long lines, and enforce the 80-column limit

0001-maint-generate-distributed-THANKS-from-VC-d-THANKS.i.patch
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0002-doc-update-HACKING.patch

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0003-maint-split-long-lines-and-enforce-the-80-column-lim.patch

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