hammer2 - Add decompression support to the recovery code

* Decompress LZ4 and ZLIB-compressed data blocks when writing
out results. Was previously leaving the blocks in a compressed
form, resul

hammer2 - Add decompression support to the recovery code

* Decompress LZ4 and ZLIB-compressed data blocks when writing
out results. Was previously leaving the blocks in a compressed
form, resulting in numerous garbage-looking files.

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