Merge branch 'embb_new'

...embbeventlog_raList__add_field_embbeventlog_decList__a.py

...embbeventlog_raWidthList__add_field_embbeventlog_decWi.py

...embbeventlog_decWidthList__chg_field_embbeventlog_raWi.py

...rations/0033_auto__chg_field_embbeventlog_durationList.py

gracedb/migrations/0034_migrate_existing_eels_to_lists.py

gracedb/models.py

gracedb/view_logic.py

gracedb/views.py

templates/gracedb/eel_detail.html

templates/gracedb/embb.json

templates/gracedb/event_detail.html