Log Message:
Update to dd_rescue 1.23.  Changelog:

In version 1.23, the default to not sync every 512 soft blocks is now really
changed to only sync at the end (documented for 1.18, but mostly ineffective,
ouch). More importantly, a short read because of EOF is now not considered an
error any more and thus neither triggers messages (with quiet) nor does it
cause a confusing exit code any more.
Version 1.22 contains a number of little improvements: Display of compiler,
compile time, enabled options, don't repeat copy attempts if hardbs == softbs,
fix FPE in progress bar for non-seekable input reverse copy, and make the code
more digestable for non-GCC compilers, optional fallbacks for strsignal, pread,
pwrite. Last not least, the documentation has a few notes on the goodies now.
Version 1.21 issues warnings when writing in a sparse mode into existing files
or to block devices.
In version 1.20, there's also a progress estimation if input file size is
unknown, but transfer size is limited with -m.
Version 1.19 brings the support for fallocate.
In version 1.18, we have changed the default to -y0 (no fsync), the avg. speed
is calculated in a meaningful way nevertheless now.
In version 1.17, a progress bar, completion percentage and ETA has been added.
In version 1.16, the work was done to determine and display the total amount of
data that will be copied.
Version 1.15 brings support for the Linux splice() mechanism to avoid copying
data to a userspace bugffer.