[vector] #15: Add "generalised scan"

[vector]

#15: Add "generalised scan"
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Reporter:  rl           |        Owner:     
    Type:  enhancement  |       Status:  new
Priority:  critical     |    Milestone:  0.8
 Version:  0.7          |   Resolution:     
Keywords:               |  
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Comment (by rl):

 FWIW, unzip is O(1) for Data.Vector.Unboxed.

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Ticket URL: <http://trac.haskell.org/vector/ticket/15#comment:8>
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