Diff against 7.15 test

New command t (test) Compared to 7.15, not only is it checked that the blocks are extractable, but also that the CRC-32 checksum of the individual files corresponds to what would be generated by actually extracting the data -verify for filesystem post-check (check that STORED CRC==DECOMPRESSED==FROM FILE) With this switch the files are reread, one by one, from the filesystem and compared. -verbose Typically it is used in case of a simulated recovery, to be sure that the extracted files are identical, beyond any doubt, to the original ones.