[2726] Enable more thorough cppcheck

It seems to check more and run longer. It also produces bunch of new
warnings.

Makefile.am

@@ -110,7 +110,8 @@ report-coverage: report-cpp-coverage report-python-coverage
 
 # for static C++ check using cppcheck (when available)
 cppcheck:
-	cppcheck --enable=all --suppressions src/cppcheck-suppress.lst --inline-suppr \
+	cppcheck -I./src/lib --enable=all --suppressions \
+		src/cppcheck-suppress.lst --inline-suppr \
 		--quiet --error-exitcode=1 \
 		--template '{file}:{line}: check_fail: {message} ({severity},{id})' \
 		src