vector<partDomain> (I use Domain in place of Field because field is for the computation of unkwowns). A component of this vector can be a ElasticField but also an other type of Domain. The Linear and Bilinear terms are included in the
domain which allow to use properly the iterative scheme with different
terms. 

The Gauss Integration Rule is also included in the Domain which allow to
choose this integration. In case of a dgLinearShellDomain
underintegration is chosen for second order shape functions and full
integration is performed for third order shape functions. NB: A lua
intereaction can be added to allow an user's choice of the Integration
Rule.

Update Benchmarks
 

FIXME: please remove dependencies to Geo/ code in Numeric/ !

* don't allocate 0-sized kdtree 

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by comparing the orientation of a line element on the boundary w.r.t. its 
connected surface element. 

However, this fails when the 3D Delaunay changes the 1D mesh (since we don't 
recover it yet).

This commits changes the algorithm to use the OpenCASCADE code path (where
we just compare one normal, pointwise).

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the status messages that slow down the mac gui

we could try to copy a mesh before generating the source mesh