#3 Cues are not marked dirty by some edits

[Chuck Linsley]

Any change to a cue should mark it dirty (modified)
until the
change is saved. However, many (most) edits do not do so.
Specifically, any change that is handled completely within
Tk (most text widgets, scale widgets, checkboxes) do not
set the dirty flag.

[Chuck Linsley]

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This has been mostly fixed by the callbacks added to fix bug
1277634. However, there are still a few widgets that do not
have Tie::Watch callbacks, and thus do not set the dirty
flag when they are changed.