4.08a
misc: test if 7z/rar rename operation is available, otherwise it will be disabled automatically. You need to enabled it manually (if supported by 7z)...I may change that to auto-enable in the future.
fixed: rare obsolete missing but fixable chd message for sets without roms
fixed: workaround for 7z.exe no-file-in-archive corruption (e.g. after removing all files from it you were not able to add new files to it)
