* When a program does not support a compression type, try to find other programs instead of failing.
This changes some library functions which are not part of the official API, but might be used by
other programs, hence the major version upgrade.
Thanks to github user benjaminwinger for the idea and initial patch!
Closes: GH bug 87
* Better detection for tar programs which compression is supported.
Closes: GH bug 86
* The Python module "tarfile" supports LZMA and XZ compressed archives.
Added tests for these archive formats (.tar.lzma and .tar.xz).
* Do not print program output when running with verbosity=-1.
Closes: GH bug 157