Log Message:
lziprecover: update to 1.22.

2021-01-02  Antonio Diaz Diaz  <antonio@gnu.org>

	* Version 1.22 released.
	* New options '-e, --reproduce', '--lzip-level', '--lzip-name',
	  '--reference-file', and '-E, --debug-reproduce'.
	* Remove '--dump-tdata', '--remove-tdata', and '--strip-tdata'.
	* main.cc (main): Report an error if a file name is empty.
	  Make '-o' behave like '-c', but writing to file.
	  Make '-c' and '-o' check whether the output is a terminal only once.
	  Do not open output if input is a terminal.
	* main.cc (decompress): With '-i', ignore data errors, keep files.
	* range_dec.cc: '-i -D' now decompresses a truncated last member.
	* '-i -D' now returns 0 if only ignored errors are found.
	* '-i' now considers any block > 36 with header a member, not a gap.
	* Replace 'decompressed', 'compressed' with 'out', 'in' in output.
	* Fix several compiler warnings. (Reported by Nissanka Gooneratne).
	* lzip_index.cc: Improve messages for corruption in last header.
	* New debug options '-M, --md5sum' and '-U, --unzcrash'.
	* main.cc: Set a valid invocation_name even if argc == 0.
	* Document extraction from tar.lz in manual, '--help', and man page.
	* New files lunzcrash.cc, md5.h, md5.cc, nrep_stats.cc, reproduce.cc.
	* lziprecover.texi: New chapter 'Reproducing one sector'.
	  New sections 'Merging with a backup' and 'Reproducing a mailbox'.
	  Document the debug options for experts.
	* check.sh: Lzip 1.16 or newer is required to run the tests.
	* testsuite: Add 9 new test files.