Ready to test prefix feature.
Now uses per-system prefix. Closes #12, makes #8 more urgent.
Added semi-intelligent loading of images.  Closes #8.
Merge branch 'master' into HDDprefix

Pulling in Sebastien's updates to include machine state info in data.
Updated formatting in Sebastien's code.
Merge pull request #14 from aard-pwfa/HDDprefix

HDDprefix accepted!