[Bugs] #2698 Calculate UNSP: Calculate allows default variables to be redefined

[Sugar Labs Bugs]

#2698: Calculate allows default variables to be redefined
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    Reporter:  greenfeld                  |          Owner:  garycmartin                
        Type:  enhancement                |         Status:  assigned                   
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Calculate                  |        Version:  0.92.x                     
    Severity:  Minor                      |       Keywords:  easy-hack                  
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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Comment(by garycmartin):

 There is a small array of reserved words in create_var_textview that could
 be added to, however these words just silently fail to apply a value to,
 the UI provides no warning or error message, and acts like it happily set
 the value. This might cause even more confusion so I've not extended this
 reserved word variable filter just for now, until I have time for adding
 some better user feedback.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/2698#comment:6>
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