* Add copy_metadata for copying files and including their metadata - sometimes
useful for copying individual files into a mounted image without using rsync.
* Remove out of date install lines from prepare_rPI.sh
Deleted /fs because it is the old version of the project and no longer used
Moved various notes and todos to /doc
Moved non-essential shell scripts from / to /shell_utils
Deleted /gpio_tests because they aren't used in the project
Dan Puttick