v4.7.0

• Use erlexec directly in relx helper functions
• add shelltest for pathname quoting in extended_start_script
• add overlay error test
• Make rlx_util:parse_vsn parse integer versions
• fix awk script check_name() in extended_bin
• avoid crash when overlay is malformed
• add upgrade test
• keep attributes when stripping beams
• Fix include_erts,true Windows releases
• ensure the erl file is writable before copying dyn_erl to it