Add contributions from Neumann boundary conditions for tracer equations discretised in a discontinuous space. This enables non-zero Neumann boundary conditions to be specified for DG tracers. (merge in from lp:~asc/fluidity/DG_Neumann, according to the request: https://code.launchpad.net/~asc/fluidity/DG_Neumann/+merge/88672)
Add contributions from Neumann boundary conditions for tracer equations discretised in a discontinuous space.
This enables non-zero Neumann boundary conditions to be specified for DG tracers.
(merge in from lp:~asc/fluidity/DG_Neumann, according to the request: https://code.launchpad.net/~asc/fluidity/DG_Neumann/+merge/88672)

jrper/fluidity,iakovos-panourgias/fluidity,rjferrier/fluidity,jjo31/ATHAM-Fluidity,iakovos-panourgias/fluidity,rjferrier/fluidity,jrper/fluidity,rjferrier/fluidity,rjferrier/fluidity,rjferrier/fluidity,jjo31/ATHAM-Fluidity,iakovos-panourgias/fluidity,jjo31/ATHAM-Fluidity,iakovos-panourgias/fluidity,jrper/fluidity,jjo31/ATHAM-Fluidity,iakovos-panourgias/fluidity,jrper/fluidity,jjo31/ATHAM-Fluidity,jrper/fluidity