Changes according review

Suppress more clang-tidy-7 warnings too

.clang-tidy

@@ -14,23 +14,32 @@ Checks:
     concurrency-*,
     #MAYBE google-*,
     hicpp-*,
+    -hicpp-explicit-conversions,
     misc-*,
+    -misc-const-correctness,
+    -misc-include-cleaner,
     modernize-*,
+    -modernize-type-traits,
+    -modernize-use-nodiscard,
     -modernize-use-trailing-return-type,
     performance-*,
     portability-*,
     readability-*,
     -readability-identifier-naming,
     -readability-identifier-length,
+    -readability-simplify-boolean-expr,
+    -readability-string-compare,
     -*-magic-numbers,
+    -*-narrowing-conversions,
+    -*-uppercase-literal-suffix,
 '
 
 HeaderFilterRegex: '.*'
 WarningsAsErrors: 'clang*'
 FormatStyle:     google
 UseColor:        false
-User:            klein_cl
 
+#MAYBE: ... example only
 CheckOptions:
   - { key: readability-identifier-naming.NamespaceCase,             value: CamelCase  }
   - { key: readability-identifier-naming.ClassCase,                 value: CamelCase  }

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.23)
+cmake_minimum_required(VERSION 3.23...3.27)
 
 project(
   "SI"

test/CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.23)
 add_executable(SI_detail_tests)
 target_sources(
   SI_detail_tests
-  PRIVATE #XXX src/Catch2Main.cc
+  PRIVATE
           src/detail_tests/detail_tests.cc
           src/detail_tests/number_parser_tests.cc
           src/detail_tests/unit_t_operator_tests.cc
@@ -33,7 +33,7 @@ target_compile_options(
 add_executable(SI_base_unit_tests)
 target_sources(
   SI_base_unit_tests
-  PRIVATE #XXX src/Catch2Main.cc
+  PRIVATE
           src/base_unit_tests/mass_tests.cc
           src/base_unit_tests/time_tests.cc
           src/base_unit_tests/electric_current_tests.cc
@@ -68,7 +68,7 @@ target_compile_options(
 add_executable(SI_derived_unit_tests)
 target_sources(
   SI_derived_unit_tests
-  PRIVATE #XXX src/Catch2Main.cc
+  PRIVATE
           src/derived_unit_tests/area_tests.cc
           src/derived_unit_tests/frequency_tests.cc
           src/derived_unit_tests/electric_charge_tests.cc
@@ -121,7 +121,7 @@ target_compile_options(
 add_executable(SI_unit_benchmarks)
 target_sources(
   SI_unit_benchmarks
-  PRIVATE #XXX src/Catch2Main.cc
+  PRIVATE
           src/benchmarks/unit_assignment_benchmarks.cc
           src/benchmarks/detail_benchmarks.cc
           src/benchmarks/string_operations_benchmarks.cc)