Add config file to the checker

See merge request !1322

[cmake] Update UseLatexMk.cmake from upstream

See merge request !1319

Fix warnings in documentation

See merge request !1320

Merge branch '356-follow-up-from-split-config-file-into-public-and-private-config-files' into 'master'

Projects without config.h.cmake have a mising HAVE_${module} definition

Closes #356

See merge request !1318

[bugfix] Include config.h in lrutest.cc

See merge request !1317

This fixes a linker error for me. Without this patch I get:

> rutest.cc:(.text._ZN3MPI9IntracommC2Ev[_ZN3MPI9IntracommC5Ev]+0x18): undefined reference to `MPI::Comm::Comm()'
> /usr/bin/ld: CMakeFiles/lrutest.dir/lrutest.cc.o: in function `MPI::Intracomm::Intracomm(ompi_communicator_t*)':
> lrutest.cc:(.text._ZN3MPI9IntracommC2EP19ompi_communicator_t[_ZN3MPI9IntracommC5EP19ompi_communicator_t]+0x2c): undefined reference to `MPI::Comm::Comm()'
> /usr/bin/ld: CMakeFiles/lrutest.dir/lrutest.cc.o: in function `MPI::Op::Init(void (*)(void const*, void*, int, MPI::Datatype const&), bool)':
> lrutest.cc:(.text._ZN3MPI2Op4InitEPFvPKvPviRKNS_8DatatypeEEb[_ZN3MPI2Op4InitEPFvPKvPviRKNS_8DatatypeEEb]+0x2a): undefined reference to `ompi_mpi_cxx_op_intercept'
> /usr/bin/ld: CMakeFiles/lrutest.dir/lrutest.cc.o:(.data.rel.ro._ZTVN3MPI3WinE[_ZTVN3MPI3WinE]+0x48): undefined reference to `MPI::Win::Free()'
> /usr/bin/ld: CMakeFiles/lrutest.dir/lrutest.cc.o:(.data.rel.ro._ZTVN3MPI8DatatypeE[_ZTVN3MPI8DatatypeE]+0x78): undefined reference to `MPI::Datatype::Free()'

Introduce a cmake policy system for the dune build system

See merge request !1269

Split config file into public and private config files

Closes #234

See merge request !1262

Handle optional dependency MPI by directly passing HAVE_MPI flag

See merge request !1310

Handle optional dependencies GMP, QuadMath, and Vc by directly passing HAVE_xxx flags

See merge request !1309

Handle optional dependencies (Par)METIS and (PT)Scotch by directly passing HAVE_xxx flags

See merge request !1308

[cmake] Backport Python 3.13 detection for older CMake versions

See merge request !1307

Handle optional dependency SuiteSparse by directly passing HAVE_xxx flags

Closes #252

See merge request core/dune-common!1294

Set the DUNE_PYTHON_WHEELHOUSE pyth even if CMAKE_INSTALL_PREFIX is set after the first run

Closes #339

See merge request !1299

Deprecate class SizeOf

See merge request !1306

[cleanup] Guard use of concept in concepts/*.hh headers

See merge request !1305

This was once added as a replacement for `sizeof...(T)`
for a variadic pack `T`, because the clang implementation
of the latter was buggy before clang 3.8. Now we require
a much newer clang version that has this but fixed for years.

[cleanup] Remove header power.hh

See merge request !1304

While these headers are already conditionally included by
`dune/common/concepts.hh` one can still include them separately.
This patch also guards these header files against individual
inclusion without available concepts support such that `headercheck`
does no longer stumble upon this.

This was deprecated in 2.9 and can be removed.
Use `Dune::power` from `dune/common/math.hh` instead.

Export the PYTHON_WHEELHOUS into the config file and cleanup MODULE_DEP_PYTHON_PATH

See merge request !1298

Increase required CMake version to 3.16

See merge request !1302

They are always set to NEW by version 3.16