[[Imported from SVN: r7137]]

[[Imported from SVN: r7136]]

[[Imported from SVN: r7135]]

[[Imported from SVN: r7134]]

[[Imported from SVN: r7133]]

[[Imported from SVN: r7132]]

[[Imported from SVN: r7131]]

add a method with an fd approximation of the derivative of the function gradient.  only for testing purposes

[[Imported from SVN: r7130]]

[[Imported from SVN: r7129]]

[[Imported from SVN: r7128]]

[[Imported from SVN: r7127]]

[[Imported from SVN: r7126]]

[[Imported from SVN: r7125]]

[[Imported from SVN: r7124]]

[[Imported from SVN: r7123]]

[[Imported from SVN: r7122]]

[[Imported from SVN: r7121]]

[[Imported from SVN: r7120]]

[[Imported from SVN: r7119]]

[[Imported from SVN: r7118]]

[[Imported from SVN: r7117]]

[[Imported from SVN: r7115]]

bugfix in computeAveragePressure: use the proper embedding of intersections into elements when integrating over the boundary

[[Imported from SVN: r7105]]

[[Imported from SVN: r7104]]

[[Imported from SVN: r7103]]

[[Imported from SVN: r7102]]

[[Imported from SVN: r7101]]

This test itself is not tested yet and may still contain bugs.

Also, I out-commented the permutation-invariance test.  I have to make
sure somehow that test points are close enough together.

[[Imported from SVN: r7100]]

[[Imported from SVN: r7099]]

a separate name.  We cannot rely on overloading for different arguments,
because embedded and non-embedded tangent vectors may have the same type.

[[Imported from SVN: r7098]]

[[Imported from SVN: r7097]]

fix sign bug in the series expansion of sin(x/2)/x.  Thanks to Jonathan Youett for pointing this out

[[Imported from SVN: r7095]]

[[Imported from SVN: r7090]]

[[Imported from SVN: r7089]]

[[Imported from SVN: r7086]]

[[Imported from SVN: r7085]]

[[Imported from SVN: r7084]]

[[Imported from SVN: r7083]]

[[Imported from SVN: r7082]]

[[Imported from SVN: r7081]]