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(After recent changes to dune-istl) BCRSMatrix::usmv() now takes three
template arguments rather than two. Since the two lines in question had
to be changed anyway, might as well make them more readable this way,
too.

Thereby bringing the tests in line with dune-fufem. The current logic of
printing a message and exciting with failure (albeit only for exceptions
of type Dune::Exception) is what happens by default anyway (but for more
general exceptions)

dune/common/fassign.hh is gone for good

The previous commit contained too many changes.  Reminder to myself:
be careful with git commit -a

I mixed up the names when writing the code.  It was always meant to be 'exists'.
No idea how that could ever work.

Another hurray for unit tests!

It does.

Note: currently disregards the 'regularity' method.  Will report an error
for test points where the functional is not differentiable.

Functionals do not have to be positive 1-homogeneous, but some important ones are.
For those it is convenient to have a test.

The first non-trivial functional that I tested outside of dune-tnnmg needed
such an epsilon.  The value I used (1e-10) has no particular meaning.
I have no idea what an ideal value is.

Otherwise the cmake test system doesn't recognize this as a failed test.

Viz, finite difference tests for addGradient, addHessian, directionalSubDiff.
I will delegate writing the actual test to somebody else.

These things can get really complicated, and small errors can go unnoticed
for a long time.

This first patch adds a first test for convexity, and applies it to the
NormFunctional class.

Otherwise you get warnings complaining about a missing file 'BuildTest.cmake'.