Silence a warning.

Some newer compilers kept warning about an out-of-bounds array access
in Point<1>::operator() but didn't indicate where exactly it came
from. This turned out to be in DataOutBase::write_eps(), a function
that is implemented only for dim==2 but was compiled also for dim==1
and dim==3 and contained this statement: 'points[vertex](1)'. The patch
reorganizes the code so that the function is only compiled for dim==2
and a more general specialization that does nothing but abort is used
for all other dimensions.
Merge pull request #94 from bangerth/silence-warning

Some newer compilers kept warning about an out-of-bounds array access
in Point::operator() but didn't indicate where exactly it came
from. This turned out to be in DataOutBase::write_eps(), a function
that is implemented only for dim==2 but was compiled also for dim==1
and dim==3 and contained this statement: 'pointsvertex'. The patch
reorganizes the code so that the function is only compiled for dim==2
and a more general specialization that does nothing but abort is used
for all other dimensions.
Fix test output project_bv_curl_conf_02.output

Remove JobId line so that after normalization the test succeeds.
Merge pull request #97 from tamiko/fix_a_test

Remove JobId line so that after normalization the test succeeds.
Patch by k3daevin: Implement at least compute the area of planar faces of 3d cells.
Further improve test to avoid square roots.
Merge pull request #96 from bangerth/implement-face-measure

Patch by k3daevin: Implement at least compute the area of planar faces of 3d cells.
Require BOOST 1.48 or later when looking for an external installation.
Merge pull request #98 from bangerth/require-newer-external-boost

Require BOOST 1.48 or later when looking for an external installation. This addresses issue #246.
Added GridTools::flatten_triangulation + one test.
Fixed WB comments.
Moved flatten triangulation to GridGenerator.
Fixed TH and WB comments.