[[Imported from SVN: r5697]]

[[Imported from SVN: r5695]]

[[Imported from SVN: r5600]]

[[Imported from SVN: r5598]]

[[Imported from SVN: r5596]]

[[Imported from SVN: r5593]]

[[Imported from SVN: r5565]]

[[Imported from SVN: r5556]]

[[Imported from SVN: r5525]]

remove code for interpolation via recursive geodesics.  It is invariant under permutation of the vertices

[[Imported from SVN: r5511]]

[[Imported from SVN: r4470]]

[[Imported from SVN: r4138]]

[[Imported from SVN: r4133]]

simpler evaluate of the function value.  Now only works with in the triangle, because there are some singularities lurking outside

[[Imported from SVN: r4076]]

[[Imported from SVN: r4072]]

[[Imported from SVN: r4068]]

[[Imported from SVN: r4067]]

bugfix: we need the derivative of the geodesic interpolation in the gradient computation (chain rule), not the derivative of the velocity interpolation

[[Imported from SVN: r4066]]

for debugging: add a method to compute gradients of local geodesic fe functions by finite-difference approximation (only 2d)

[[Imported from SVN: r4065]]

[[Imported from SVN: r4062]]

implement interpolation of the gradient for members of SO(3), some of this is still educated guesswork, though

[[Imported from SVN: r4060]]

[[Imported from SVN: r4057]]