"    Input:  {
              (start_form)        - if 'yes', add form
              (url1)              - URL with all prefixes to create on change
              (form_name)         - form name
              (background_div)    - if !='' use this as background div

              (selector)          - dict with selector

              (crowd_key)         - extend selector keys if called from crowd-tuning
              (crowd_on_change)   - use on_change if called from crowd-tuning

              (wchoices)          - prepared unique choices

              (original_input)    - original (high-level) input from web to check keys

              (add_refresh_cache) - if 'yes', show button to refresh cache
              (add_reset)         - if 'yes', show buttons to reset form and show all choices
            }

    Output: {
              return       - return code =  0, if successful
                                         >  0, if error
              (error)      - error text if return > 0

              html
            }

"