Put a console on ttyS1.
Switch git url to https.
Change ftp to http.
Move all copy operations from make_iso.sh to Dockerfile.
Use alternate debian mirror and fix RUN/COPY lines for legibility.
Merge pull request #529 from fdawg4l/MoveCopiestoDockerfile

Move copiesto dockerfile
Fix a few minor issues with the Dockerfile (both for buildability and cacheability)