Bug fix in CifFileFinderTest

Test would not run because I built the class without the config.
Add retry helper and ftp helper

The retry helper is something to help retry requests that can fail. For example,
making web requests and fetching something from the FTP site. These things can
fail sometimes so we need to allow for retries of them. Also, I've added an FTP
helper to make it easier to fetch files from an FTP site.
Add initial outline of an nt quality importer

I've added the initial pass at outlining something that will import NT quality
data. The idea is to fetch the file from the FTP site, unzip it, then parse the
XML to create nt level annotations. I haven't examined files to see all that
needs to be added, but this is the initial pass at the structure that will be
used.