Maps the given name of a bzip2-compressed file to the name that the
file should have after uncompression. Commonly used file type specific
suffixes like ".tbz" or ".tbz2" are automatically detected and
correctly mapped. For example the name "package.tbz2" is mapped to
"package.tar". And any filenames with the generic ".bz2" suffix
(or any other generic bzip2 suffix) is mapped to a name without that
suffix. If no bzip2 suffix is detected, then the filename is returned
Maps the given filename to the name that the file should have after
compression with bzip2. Currently this method simply appends the suffix
".bz2" to the filename based on the standard behaviour of the "bzip2"
program, but a future version may implement a more complex mapping if
a new widely used naming pattern emerges.