The last commits caused compile errors for e.g. clang as I used
incomplete (only forward declared) types in template classes.
This patch moves the definition of InverseOperator and Preconditioners
from the headers solvers.hh and preconditioners into new separate
headers solver.hh and preconditioner.hh. This allows to include these
definitions in the previous headers without cause circular include directives.

This fixes FS #1224

Previously if the solver did not converge the number of iterations
that was printed and stored was one higher than the actual value.

With OpenMPI there appeared cases where MPI_Comm_free
was called after MPI_Finalize. This was caused by the
destructor of OwnerOverlapCopyCommunication being called
after MPI_Finalize.
This patch moves the destruction out of the main method.
If MPI 2 functionality is available we also check whether
MPI_Finalize was called before freeing the communicator and
only call free if not.

Previously we relied on CMake's export(PACKAGE ...) function when
finding dune packages without dune-control. This is error prone
when using several instances of a dune-module (either with differing
versions or built using different options). In this case there is no
control which of the instances is used.

Now we try to guess the correct build directory, if it was not
provided with ${module}_DIR, ${module}_Root or in the
CMAKE_PREFIX_PATH. Note that when using dunecontrol ${module}_DIR will
always be set. We take the path of the current toplevel build
directory and simply substitute any occurence of the name of current
module with name of the module that we try to find. This works for
both  building in a subdirectory of the source tree
(e.g. ${module-source}/build-cmake) or in a sibling directory

For A*B^T it is necessary to have matching columns, not rows.

[[Imported from SVN: r1927]]

Find<Package>.cmake modules, as they were missing with set
CMAKE_DISABLE_<Package>=TRUE.

Now they are in speparte modules Add<Package>Flags and thus can be
used as exspected with disabled packages.

[[Imported from SVN: r1926]]

removed duplicate entries while at it

[[Imported from SVN: r1925]]

[[Imported from SVN: r1924]]

This is necessary to make tarballs configure

[[Imported from SVN: r1923]]

parmetis functionality is there.

[[Imported from SVN: r1922]]

[[Imported from SVN: r1921]]

[[Imported from SVN: r1920]]

[[Imported from SVN: r1919]]

to fix broken "make doc" and "make headercheck".

[[Imported from SVN: r1917]]

[[Imported from SVN: r1916]]

[[Imported from SVN: r1911]]

(kudos to Elias Pipping for the patch)

[[Imported from SVN: r1910]]

Get rid of two warnings.

[[Imported from SVN: r1909]]

Four warnings are left for two variables - I don't know what they do.

[[Imported from SVN: r1908]]

Include some other header that are used, to make headercheck
pass again.

[[Imported from SVN: r1905]]

There is not constructor taking 0 as an argument.

[[Imported from SVN: r1904]]

SVN ignore new tests.

[[Imported from SVN: r1903]]

[Merge][Bugfix] r1895 from branches/release-cmake-2.2:  Prevent definition of HAVE_BOOST without value due to race conditions in some autoconf versions.

For some autoconf versions there was a race condition between ax_boost_base.m4 and dune_boost_base.m4 resulting in HAVE_BOOST being defined with no value (instead of ENABLE_BOOST). For others there were even two definitions of it (one with and one without value). 

This patch renames the symbol being defined in dune_boost_base.m4 to HAVE_DUNE_BOOST and defines a value for it if boost is found.

Please change your code such the preprocessor directives checking for boost from
#if HAVE_BOOST
to
#if HAVE_DUNE_BOOST

Resolves flyspray 1265 and presumably 1249.

This time the patch is clean (as opposed to r1896 which was reverted in r1901).

[[Imported from SVN: r1902]]

[[Imported from SVN: r1901]]

[[Imported from SVN: r1900]]

The latter is the location of the package configuration files.

[[Imported from SVN: r1899]]

[[Imported from SVN: r1898]]

[[Imported from SVN: r1897]]

[Merge][Bugfix] r1895 from branches/release-cmake-2.2: Prevent definition of HAVE_BOOST without value due to race conditions i
n some autoconf versions.

For some autoconf versions there was a race condition between ax_boost_base.m4 a
nd dune_boost_base.m4 resulting in HAVE_BOOST being defined with no value (inste
ad of ENABLE_BOOST). For others there were even two definitions of it (one with 
and one without value). 

This patch renames the symbol being defined in dune_boost_base.m4 to HAVE_DUNE_B
OOST and defines a value for it if boost is found.


[[Imported from SVN: r1896]]

[Bugfix] Prevent definition of HAVE_BOOST without value due to race conditions in some autoconf versions.

For some autoconf versions there was a race condition between ax_boost_base.m4 and dune_boost_base.m4 resulting in HAVE_BOOST being defined with no value (instead of ENABLE_BOOST). For others there were even two definitions of it (one with and one without value). 

This patch renames the symbol being defined in dune_boost_base.m4 to HAVE_DUNE_BOOST and defines a value for it if boost is found.

Please change your code such the preprocessor directives checking for boost from
#if HAVE_BOOST
to
#if HAVE_DUNE_BOOST

Resolves flyspray 1265 and presumably 1249.

[[Imported from SVN: r1895]]

[[Imported from SVN: r1894]]