Stop Django stuff being written to logs

Set "propagate = False" in the Django
loggers, to prevent the wildcard '' logger
also picking up the django output and
filling the screen with stuff we don't want.
Use absolute paths for image locations

Makes sure the image archive and web locations
are absolute directory paths.
Merge branch 'master' of https://github.com/ARGANS/TOUCAN into rayleigh
backup before refactoring sor per-pixel mode