The majority of developers favor individual headers for (emulation of) C++11
features over collecting them in a single header cxx11.hh. This patch
renames cxx11.hh to constexpr.hh and moves it into the subdirectory std.
This is the place most developers would like these headers in (see
http://users.dune-project.org/doodles/4).

As decided on the developer meeting in Aachen, we support (but do not
rely on) the C++11 keyword constexpr. This patch adds an m4-check for
constexpr and a header (cxx11.hh) defining a macro DUNE_CONSTEXPR either
as constexpr or empty (depending on the compiler support for it). It is
then used in FieldVector and FieldMatrix on size, rows, and cols.

With the exception of mpicollectivecommunication.hh
and propertymap.hh, which I didn't understand.

[[Imported from SVN: r6784]]

[[Imported from SVN: r6512]]

[[Imported from SVN: r6188]]

[[Imported from SVN: r6184]]

* factor out most of the FieldMatrix math methods

missing: several functions oculd not me moved, as they require som
		 kind of type promotion traits

[[Imported from SVN: r6181]]

[[Imported from SVN: r6166]]

vectors using different storage containers

[[Imported from SVN: r6128]]

[[Imported from SVN: r6065]]

[[Imported from SVN: r5928]]

methods.  Make the arguments template parameters as in the general case.

This fixes FS 745.  Please merge to the release branch.

[[Imported from SVN: r5912]]

* add a specialization of sqrt to fvmeta, this should fix the
  ambiguous sqrt(int)

merge to release

[[Imported from SVN: r5874]]

[[Imported from SVN: r5858]]

*Add const to *multiplyany()
*Implement *multiplyany() for FieldMatrix<k,1,1>
Thanks to Atgeirr Flø Rasmussen!

[[Imported from SVN: r5704]]

[[Imported from SVN: r5683]]

[[Imported from SVN: r5662]]

* hide specializations from doxygen
* use ROWS and SOLS instead of n and m for the FieldMatrix
* use conjugateComplex instead of fm_ck
* document istl_assign_to_fmatrix

[[Imported from SVN: r5659]]

  type
* make *norm* in fvector and fmatrix use this real type

[[Imported from SVN: r5656]]

* update Makefiles and configure

[[Imported from SVN: r5643]]

[[Imported from SVN: r5609]]

[[Imported from SVN: r5608]]

[[Imported from SVN: r5581]]

Note that the current implementation of the determinant is rather
subobtimal.  While it is rather efficient, it is neither the most
numerically stable way to compute the determinant, nor does it work
for integers.  But I think it is much better than no implementation at
all.

[[Imported from SVN: r5549]]

[[Imported from SVN: r5548]]

[[Imported from SVN: r5532]]

[[Imported from SVN: r5531]]

(using LAPACK for dim > 2)


[[Imported from SVN: r5516]]

[[Imported from SVN: r5467]]

[[Imported from SVN: r5431]]

[[Imported from SVN: r5303]]

[[Imported from SVN: r5249]]

[[Imported from SVN: r5157]]

[[Imported from SVN: r5077]]

[[Imported from SVN: r5072]]

[[Imported from SVN: r5029]]

because the code doesn't contain conditionals.

[[Imported from SVN: r4979]]

[[Imported from SVN: r4978]]

grrr! testing for !=0 skips row zero.

loops now start with n and the first step is --i and we are testing
for i>0.

[[Imported from SVN: r4833]]