configured) the firmware

identification problem of the bb during the update of the rootfs and
add to the barebox.bin the version of the wr firmware

firmware and modify echo message.

firmware files in images/wr-remote. It uses the script wrs_remote_update
for parsing the configuration of the service and version of the firmware
to update.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This changes a while the flash script, and updates the documentation
accordingly. It is a single commit because I couldn't test the script
until all changes were in place

Main changes:
  - fixed used interation: now it stops asking to remove the jumper
  - if "-b" is used and WRS_BASE_DIR is unset, defaults to current dir
  - all temporary files are in a specific directory, reported to the user
  - the script checks for the required files as first step, to err out soon
  - the 5-second sleep is removed, as there's an interactive step anyways
  - error messages are a little more verbose, to understand what was wrong
  - option parsing is more selective about flags for the flasher
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>