fix ab4s:import update booking activation/deactivation.  WIP #1
dont deactivate all bookings in the case of missing import file or failed import
[ab4s:import] remove unnecessary debug message
[ab4s:import] coding style formatting
[ab4s:import] clearify code comment
Fixes #6 : ab4s:import update does not actually update booking information
implement booking update mechanism
[ab4s:import] on update, make sure an existing booking is found before proceeding
[ab4s:import] do not update existing bookings when "update" command is not used
[ab4s:import] improve existing destination detection on moving folder
[ab4s:import] remove unnecessary commented code
remove unnecessary core dump file generated by php crash in the repo
[ab4s:import] fix booking update regressed users import
[ab4s:import] Display ID as "duplicated" when ID is null which happens when duplicated record found and update is not performed
edit franchise banner image
[ab4s:import] refactor production/testing path
[ab4s:import] tidy up code a bit
[ab4s:import] remove TODO marking in comment for update command
enable caching
disable caching for steer backend (it breaks filter search)
disable etag in production
Revert "disable etag in production"

This reverts commit f6c2a14c6a90df5d3f78df919353a5f3b763dbaa.