Correct the mechanisms for setting the caption of a frame.

Note: This appeared in issue 60019, but I am putting it as a separate issue
because it is not related to "linked frames".

The "Frame" window (i.e., the window that pops up when you double-click on a
frame) does not have a tab for setting and formatting the caption of the frame.
This can only be done only through the context menu of the frame. Provide a tab
in the "Frame" window to set caption.

Secondly, the context menu contains "Frame..." command, which should be renamed
to "Properties...", which is a standard practice. The user is likely to think
that it provides a list of all frames in the current document!

Note that such a list COULD be used to link the current frame with another
frame; so the user should be excused for overlooking this command while he is
looking for the familiar "Properties..." command.

Look at it from another angle: 
The context menu of any object should be about something MORE specific about
that object. For example, 
> A specific property of the object (e.g. "alignment")
> All properties of the object (the "Properties..." command)
> A specific PART of the object (e.g. "caption")

But repeating the object's name in a command does NOT mean "its properties".