Capturing any polymorphic object by value is wrong,
and gcc 8 started to warn about this in the case
of exceptions.

[[Imported from SVN: r8150]]

[[Imported from SVN: r8048]]

This is needed to test quad elements and higher-order gfe.

[[Imported from SVN: r8047]]

[[Imported from SVN: r8025]]

change return type of LocalGFETestFunction. Instead of a std::vector(lagrangepoints * tangentdim) it now returns a vector<arrays< ,tangentdim> >(lagrangepoints). This way it is easier to identify local coefficients with their corresponding basis functions.   

[[Imported from SVN: r7916]]

[[Imported from SVN: r7909]]

[[Imported from SVN: r7908]]

[[Imported from SVN: r7904]]

[[Imported from SVN: r7903]]