[Bugs] #3653 Calculate UNSP: Calculate does not raise negative exponents in history, leading to confusion

[Sugar Labs Bugs]

#3653: Calculate does not raise negative exponents in history, leading to
confusion
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    Reporter:  greenfeld                  |          Owner:  rwh                        
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Calculate                  |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 1. Start Calculate.
  2. Enter "8**2".  You will be told that the result of 8^2^ is 64.
  3. Enter "8**-1".  You will be told the result of the calculation "8-1"
 is 0.125.

 The exponent needs to be raised in the history view in the second case,
 just like the first.

 Seen in OLPC 12.1.0 os11/Calculate-40, 11.3.1 os885/Calculate-37.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3653>
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