Support tar.bz2 format for dumpers' "uncompress" feature

[erikyao]

Quote from Manifest-based data plugins:

uncompress: once data is downloaded, this flag, if set to true, will uncompress all supported archives found in the data folder. Currently supported formats are: *.zip, *.gz, *.tar.gz (includes untar step)

However, there exist plugins relying on tar.bz2 data files, and uncompressing is feasible though tarfile module. E.g.

import tarfile
tar = tarfile.open("foobar.tar.bz2", "r:bz2")
tar.extractall()
tar.close()

Related python module is biothings/utils/common.py. Note that tarfile module is already installed.

[erikyao]

Also consider supporting bz2 in anyfile function.