We stop using bzip2, because implemetnation of python 2.7 bz2 is uncompatible with pbzip2. So tarball created with pbzip2 cannot be uncompressed with python. So we need to find a speedy and portable compression algorithm. Gzip is the best candidate
Can be removed when min default will be python 2.7
Now use databases function to delete files from repository
This allow method add in Tarfile to have filter parameter. This give us filter capa on file to include. Should be removed when python 2.7 will be the minimum version
New module tools offer functions to base is class and also to setup scripts. Drop RepositoryBase class.