#23 Xarchiver tbz archives support

[Giuseppe Torelli]

I can open .tbz archives (FreeBSD binary packages), browse directories inside
them and extract them from the context menu without a problem.
But if I open them and double-click any file to open/view/execute it, it does
absolutely nothing. No error message what-so-ever, and nothing on the console
when I execute xarchiver from there either.
Also, if I open an archive and try to extract "Selected Files", nothing is
extracted. Extract "All Files" works perfectly fine though.