Automatic native suffix

[indolering]

Since lrzip is mostly a preprocessor for standard compression formats it would be easier for clients to decompress the end-result if the compressor would automatically attach the suffix of whatever the final compression format is.

[pete4abw]

The end result would not be usable by standard decompression. The header alone would break gzip or bzip or other decompression methods. lrzip -i would show file compression method. and lrzip -d would decompress using the appropriate decompression method.