Fix all true spelling errors found by 'codespell'

bin/dunecontrol

bin/duneproject

cmake/modules/DuneInstance.cmake

cmake/modules/DuneModuleDependencies.cmake

cmake/modules/DuneProject.cmake

cmake/modules/DunePythonCommonMacros.cmake

cmake/modules/DunePythonInstallPackage.cmake

cmake/modules/DuneTestMacros.cmake

cmake/modules/FindPTScotch.cmake

cmake/modules/FindSuiteSparse.cmake

cmake/modules/Headercheck.cmake

cmake/modules/UseLatexMk.cmake

doc/comm/indexset.cc

dune/common/bartonnackmanifcheck.hh

dune/common/debugallocator.hh

dune/common/densematrix.hh

dune/common/dynvector.hh

dune/common/float_cmp.hh

dune/common/hash.hh

dune/common/parallel/benchmark/mpi_collective_benchmark.cc