Bug fixes: ---------- * write all 'about' metadata fields out, not just select few #2488 * fix lists getting nested during merging of configs, leading to TypeErrors #2494 * make always_include_files act on host_prefix, not build_prefix #2497 * warn users when script_env passes env vars through #2502 * fix build string pyXY being just pyX when input didn't have full python version #2504