ddrescue: upgrade 1.28 -> 1.29

License-Update: address changed to <http://fsf.org/>

Changelog:
==========
- The new option '--continue-on-errno' has been added.
- If ddrescue exits because of a fatal read error, it now prints the value of
  the variable 'errno' so that it can be used as argument to
  '--continue-on-errno'.
- When using '--ask' and '--verbose', print rescue options before asking user.
- Option '--log-reads' now records the value of errno if different from EIO.
  (The four changes above suggested by Christian Franke).
- The effect of option '-O, --reopen-on-error' has been extended to all phases.
- It has been documented in the manual that '--reopen-on-error' may be needed
  when using '--continue-on-errno'.
- A compilation error on FiwixOS 3.3 about an ambiguous call to std::abs has
  been fixed. (Reported by Jordi Sanfeliu).
- The chapter 'Syntax of command-line arguments' has been added to the manual.
- Two examples of combined use with lziprecover have been added to the manual.
  (One of them uses the new Forward Error Correction (FEC) feature of
  lziprecover).
- It has been documented in the manual that option '-b' of ddrescuelog is
  position dependent. (Reported by Winston B. E.).

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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