fix resque task user switching
move login/logout to separate method
better spacing for additional user checkboxes
allow tests to work when users need an ordergroup to order

This is required for tests to work when the signup plugin is enabled.
add plugins #custom
add configuration for default language
edit order user-interface update

also closes foodcoops#145
show supplier user-interface update
expanded data-ignore-onchange support
improved shared database import ui
allow 500 items per page
make apple points optional

a next step would be to move this to a plugin
add ordergroup to user form (view)
make ordergroup editing work from user form
allow to set initial parameters for ordergroup in group creation form
show ordergroup directly if requested
fix bug when no parameters given
add tests and make editing ordergroups with user work
fix slightly broken user form, made visible by deface
add foodcoop-adam specific configuration #custom