# Counts and selects pages of GPX traces for various criteria (by user, tags, public etc.).
# target_user - if set, specifies the user to fetch traces for. if not set will fetch all traces
# paging_action - the action that will be linked back to from view
# Counts and selects pages of GPX traces for various criteria (by user, tags, public etc.).
# target_user - if set, specifies the user to fetch traces for. if not set will fetch all traces
# paging_action - the action that will be linked back to from view