Add .clang-tidy file

.clang-tidy

@@ -1,9 +1,42 @@
 # Settings file automatically used by clang-tidy
+# Heavily adapted from the deal.II clang-tidy file
 #
 # See ./contrib/utilities/run_clang_tidy.sh for details
 
-# We disable performance-inefficient-string-concatenation because we don't care about "a"+to_string(5)+...
+#
+# Rationale for disabling warnings:
+#
+# - selected modernize-* warnings:
+#   Some of these produce a lot of noise for limited utility.
+#
+# - performance-inefficient-string-concatenation:
+#   We don't care about "a"+to_string(5)+...
+#
+# - performance-no-automatic-move:
+#   All modern compilers perform the return value optimization and we prefer
+#   to keep things const.
+#
 
-Checks: "-*,cppcoreguidelines-pro-type-static-cast-downcast,google-readability-casting,modernize-*,-modernize-pass-by-value,-modernize-raw-string-literal,-modernize-use-auto,-modernize-use-override,-modernize-use-default-member-init,-modernize-use-transparent-functors,use-emplace,mpi-*,performance-*,-performance-inefficient-string-concatenation"
+Checks: >
+  -*,
+  cppcoreguidelines-pro-type-static-cast-downcast,
+  modernize-*,
+  -modernize-avoid-c-arrays,
+  -modernize-concat-nested-namespaces,
+  -modernize-pass-by-value,
+  -modernize-raw-string-literal,
+  -modernize-return-braced-init-list,
+  -modernize-use-auto,
+  -modernize-use-default-member-init,
+  -modernize-use-nodiscard,
+  -modernize-use-override,
+  -modernize-use-trailing-return-type,
+  -modernize-use-transparent-functors,
+  mpi-*,
+  performance-*,
+  -performance-inefficient-string-concatenation,
+  -performance-no-automatic-move,
+  -performance-avoid-endl,
+  readability-qualified-auto
 
 WarningsAsErrors: '*'