moved Audience Level to a more logical spot in _proposal_fields
moved Audience Level to a more logical spot in _proposal_fields

pinax/symposion,toulibre/symposion,toulibre/symposion,mbrochh/symposion,NelleV/pyconfr-test,pydata/symposion,pyconca/2013-web,miurahr/symposion,pydata/symposion,mbrochh/symposion,miurahr/symposion,pyconca/2013-web,faulteh/symposion,TheOpenBastion/symposion,euroscipy/symposion,TheOpenBastion/symposion,pyconau2017/symposion,python-spain/symposion,pyohio/symposion,pyohio/symposion,python-spain/symposion,faulteh/symposion,euroscipy/symposion,pinax/symposion,NelleV/pyconfr-test,pyconau2017/symposion