Add support for extracting data out of Illumina's new RTA runfolder.

Add support for extracting data out of Illumina's new RTA runfolder.
I dropped extraction of matrix & phasing for the moment, no one was
looking for them, and I need to go back to one matrix per lane
for RTA Intensity directories. I'm also not sure where the phasing
information might be being stored.

Another weakness is if there is a firecrest directory the run scanning
wasn't finding the intensities directory.