PSPP-BUG: [bug #24975] Show variable attributes in var sheet

[Ben Pfaff]

Follow-up Comment #2, bug #24975 (project pspp):

>...the dictionary needs an additional structure which will contain
>the union of all the sets of variable attribute names for all 
>variables in that dictionary.

It really doesn't sound ideal to put this in struct dictionary, since most
struct dictionary clients have no interest in it.  To me, it sounds like a
better idea to put it in an auxiliary structure that PSPPIRE maintains (I
think that we have PsppireDictionary or some such object) and update it from a
callback when something changes.

If we don't have all the necessary callbacks for this then I'd be glad to add
them.

>This structure also will need to be indexable by integer value.
>I suggest that Ben's abt structure containing reference counted
>elements would be the way to go.

It certainly sounds like a reasonable option.

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