[Kst] memcheck bug in the datawizard

[Barth Netterfield]

so... I've been wondering why I was getting out of memory crashes trying to 
read massive amounts of data - we have a memchecker which is suppose to catch 
those.  It hasn't been.

Well... it turns out that back when the vector selection got turned into the 
two column format, the bug addressed by this patch was intoduced.

So... the following patch makes the memchecker work again.

cbn
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