[Dune] [#1011] operator* in densevector used as dot product in dune-istl is not suitable for complex vectors

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FS#1011 - operator* in densevector used as dot product in dune-istl is not suitable for complex vectors
User who did this - Jö Fahlke (joe)

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There was a decision about this in the Dune-Dev-Meeting 2012 in Münster (see
http://users.dune-project.org/projects/dev-meeting-2012/wiki/Topics).

In essence:
 - We want a free function dot(a,b), where a and b have the same recursive
   blocking structure, but may have different field types.
   + This function should work for all meaningful combinations of fundamental
     types and complex<fundamental type> [1].
   + This functions should work for scalars, dense vectors and ISTL vectors
     [2].
 - On the vector classes we want a template method a.dot(b), with the same
   limitations for a and b as above.
 - The complex conjugate should be done in the same argument as it is done by
   matlab [3].

[1] This requires promotion traits to determine the return type.  Markus had
    implemented promotion traits (also in the context of complex) at some
    point, but had to revert because of high-level problems in PDELab.  This
    could however be used as a starting point.

[2] The destinction between vector on one hand and scalars and complex on the
    other hand can be done by checking whether the type A of the argument has
    a member type A::FieldType.

[3] We found that pythons dot() is simply operator*().  Matlab does have dot()
    with complex conjugate, but I don't remember which of the two arguments is
    conjugated.

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More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=1011#comment3745

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