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Deleting dd_rescue, pkgsrc proper updated.

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Import dd_rescue-1.33 as wip/dd_rescue.

Like dd, dd_rescue does copy data from one file or block device to another.
You can specify file positions (called seek and Skip in dd).

There are several differences:
* dd_rescue does not provide character conversions.
* The command syntax is different. Call dd_rescue -h.
* dd_rescue does not abort on errors on the input file, unless you specify a
  maximum error number. Then dd_rescue will abort when this number is
  reached.
* dd_rescue does not truncate the output file, unless asked to.
* You can tell dd_rescue to start from the end of a file and move backwards.
* It uses two block sizes, a large (soft) block size and a small (hard) block
  size. In case of errors, the size falls back to the small one and is
  promoted again after a while without errors.
* It does not (yet) support non-seekable in- or output.