Code review comment for lp:~fluidity-core/fluidity/iceshelf

Thanks everyone for good thoughts.
I will start from merging in the thermodynamics part first and work the way up.

Toshi

> This branch also contains features currently being worked on in other
> branches, which themselves are under merge review. These features are not
> required by the ice shelf thermodynamics, which is what this merge concerns
> and should be removed from the branch.
>
> These include:
> lp:~asc/fluidity/extrudeup
> lp:~asc/fluidity/regularisespatialaspect
> lp:~asc/fluidity/here
> lp:~asc/fluidity/dgifychoice