cxxll::elf_image::dwarf_cu_range: Reported format information on error
cxxll::elf_image::dwarf_cu_range: Reorder implementation
cxxll::elf_image::dwarf_cu_range: More error reporting for DW_AT_name
cxxll::elf_image::dwarf_cu_range: Remove uneeded partial CU handling
Fix symboldb.elf_runpath integration test
Make integration test script more robust against SQL failures
More regular file names for expected integration test results
Switch integration test results to CSV format

This addresses the ambiguity for NULL values