FEATURE REQUEST: recognize tgz and tbz2 as a compression suffixes

[Jari Aalto]

Cf. http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=561411

    $ file xtitle-1.0.1.tgz
    xtitle-1.0.1.tgz: gzip compressed data, was "xtitle-1.0.1.tar", from Unix, 
last modified: Thu Dec 10 15:25:49 2009

    $ gzip -dc xtitle-1.0.1.tgz
    xtitle-1.0.1.tgz does not have compressed suffix -- skipping
    tar: This does not look like a tar archive
    tar: Exiting with failure status due to previous errors

SUGGESTION

Please add support to recognize *.tgz and *.tbz2 suffixes as valid
standard compressions extensions. E.g. the *.tgz has been widely in use
since early days of Slackware.

Jari