Add an undo move capability

[olibclarke@…]

Begin forwarded message:

From: Oliver Clarke via ChimeraX-users <chimerax-users@…>
Subject: Re: [chimerax-users] Trackpad scaling causes unintended rotation
Date: September 29, 2021 at 1:13:21 PM PDT
To: Tom Goddard <goddard@…>
Cc: ChimeraX Users Help <chimerax-users@…>
Reply-To: Oliver Clarke

...

Relatedly, it would still be great to have an "undo move" - really "undo change view" - in ChimeraX, either as a separate undo stack or integrated into the global one somehow... in Chimera I use "undo move" a lot. I know, I should regularly save and label views, but old habits die hard!

Cheers
Oli