[patch #5614] Make "struct variable" opaque: phase 1

[Ben Pfaff]

Update of patch #5614 (project pspp):

                  Status:   Ready For Test/Review => Done                   
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #2:

>I can't see any problems here. I haven't examined it in detail, 
>but like you say, it's pretty simple. 

OK, I checked it in.

>Why are the changes to the tests necessary? 

I noticed that some tables had titles of the form "<varname>: <varlabel>". 
When the variables had no label, this came out as "<varname>: ", which
doesn't look good.  So I change it to be just "<var-label-or-name>" using
var_to_string().

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