hack: add explicit cast to FieldVector to compile the code again after the introduction of DenseVector in dune-common

[[Imported from SVN: r6390]]

[[Imported from SVN: r6389]]

[[Imported from SVN: r6388]]

[[Imported from SVN: r6327]]

[[Imported from SVN: r6309]]

[[Imported from SVN: r6306]]

[[Imported from SVN: r6301]]

[[Imported from SVN: r6300]]

[[Imported from SVN: r6299]]

[[Imported from SVN: r6298]]

[[Imported from SVN: r6297]]

[[Imported from SVN: r6296]]

[[Imported from SVN: r6295]]

[[Imported from SVN: r6294]]

[[Imported from SVN: r6293]]

[[Imported from SVN: r6215]]

That makes the code more readable, which is more important to me than
speed.  The stuff is difficult enough as it is.

[[Imported from SVN: r6214]]

[[Imported from SVN: r6213]]

factor out the computation of the linear part of the reference-simplex-to-standard-simplex computation

[[Imported from SVN: r6212]]

[[Imported from SVN: r6211]]

[[Imported from SVN: r6210]]

[[Imported from SVN: r6209]]

[[Imported from SVN: r6046]]

[[Imported from SVN: r5996]]

[[Imported from SVN: r5995]]

[[Imported from SVN: r5994]]

[[Imported from SVN: r5993]]

[[Imported from SVN: r5992]]

[[Imported from SVN: r5991]]

[[Imported from SVN: r5989]]

[[Imported from SVN: r5988]]

[[Imported from SVN: r5986]]

Compute the local corrections in local coordinates on the tangent bundle now, instead of using the embedding in the surrounding space

[[Imported from SVN: r5985]]

[[Imported from SVN: r5984]]

[[Imported from SVN: r5966]]

[[Imported from SVN: r5965]]

[[Imported from SVN: r5964]]

For this now the TangentVector class of S^n has only n components,
while the EmbeddedTangentVector class still has n+1.
The code around it needs to be fixed accordingly.

[[Imported from SVN: r5963]]

[[Imported from SVN: r5958]]

remove the possibility to solve the inner problem with a truncated cg.  It never really worked and complicates the code

[[Imported from SVN: r5951]]