Adding upstream version 1.13~rc1.upstream/1.13_rc1

Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>

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+Description
+
+Lziprecover is a data recovery tool and decompressor for files in the
+lzip compressed data format (.lz) able to repair slightly damaged files,
+recover badly damaged files from two or more copies, extract undamaged
+members from multi-member files, decompress files and test integrity of
+files.
+
+Lziprecover is able to recover or decompress files produced by any of
+the compressors in the lzip family; lzip, plzip, minilzip/lzlib, clzip
+and pdlzip. This recovery capability contributes to make the lzip format
+one of the best options for long-term data archiving.
+
+When recovering data, lziprecover takes as arguments the names of the
+damaged files and writes zero or more recovered files depending on the
+operation selected and whether the recovery succeeded or not. The
+damaged files themselves are never modified.
+
+When decompressing or testing file integrity, lziprecover behaves like
+lzip or lunzip.
+
+If the files are too damaged for lziprecover to repair them, data from
+damaged members can be partially recovered writing it to stdout.
+
+To give you an idea of its possibilities, when merging two copies each
+of them with one damaged area affecting 1 percent of the copy, the
+probability of obtaining a correct file is about 98 percent. With three
+such copies the probability rises to 99.97 percent. For large files with
+small errors, the probability approaches 100 percent even with only two
+copies.
+
+If the cause of file corruption is damaged media, the combination
+GNU ddrescue + lziprecover is the best option for recovering data from
+multiple damaged copies.