If you rely on it, add the deleted CMake files to your module.

Similar to last commit:
This macro was split off from DuneMacros.cmake in commit
e63ea0cf, but the new macro file was
not included in the list of installed modules.

This is e.g. needed for dune-alugrid and might be a first step for
getting rid off the ParMETIS dependency.

DuneCmakePackageConfigHelpers.cmake -> DuneCMakePackageConfigHelpers.cmake

Apparently it is not available with some older versions of CMake.
Therefore we provide a poor man's alternative for it, if it is
not there.

Previously, the macros were installed to $(datadir)/cmake/. As we have
some macros in DUNE that might also be in other packages
this may cause conflicts in package managers. With this patch we install
them to $(datadir)/dune/cmake to resolve this issue. Together with the
last patch this will resolve problems  outlined in flyspray
task 813
https://dune-project.org/flyspray/index.php?do=details&task_id=813
I apologize for givin the wrong task number in the previous patch.

This patch adds test for both CMake and autotools as the
build system.
UMFPack is used by several dune modules (e.g. fem and istl)
the only common required module by both is common. Therefore
we add the test here to make it usable for all modules.

BTW: These tests are taken from Dominics branch of dune-istl.
     Therefore he deserves the credit for them.

They do not find a package but check for a feature.
This avoids false warnings about not found packages.
Merged FindCXX11Conditional.cmake and FindCXX11Features.cmake.

[BuildSystem][autotools] Add FinalizeHeadercheck.cmake to installation file list of cmake/scripts instead of incorrect cmake/modules.

If not found, our own fallback implementation will be used.

[[Imported from SVN: r7373]]

[[Imported from SVN: r7129]]

[[Imported from SVN: r7128]]

[[Imported from SVN: r7124]]

Install CMake files with autotools.

[[Imported from SVN: r7119]]