[[ Bug 11006 ]] Make sure the stack's (UTF8) title isn't iso<->mac translated on load.
[[ Bug 11006 ]] Make sure setting the title on Mac can't fail if the UTF8 string is invalid (although the fix to the bug means it should never be invalid).
Merge branch 'bugfix-11006' into release-6.1.0
[[ Bug 10999 ]] Made 'flip' throw an error if not an editable image (like rotate).
[[ Bug 10999 ]] Added release note.
Merge branch 'bugfix-10999' into release-6.1.0