[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 choener):

 It's worth a lot as it means I can unzip the input vector to get the
 individual components and use the functions on them without big problems
 -- of course, right now I use PrimitiveArrays as they have less overhead
 in some cases (I think).

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Ticket URL: <http://trac.haskell.org/vector/ticket/15#comment:9>
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