[Bugs] #1179 UNSP: add invert feature to Measure

[SugarLabs Bugs]

#1179: add invert feature to Measure
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    Reporter:  walter                     |          Owner:  walter                     
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Measure                    |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 1) Invert the curve of the reading of sensor:  Some of the resistive
 sensors
 are Negative Temperature Coefficient (NTC), which means that the value
 decrease in resistance when subjected to an increase in temperature,
 humidity, etc. If teachers are working with young children, the value
 may not be as important as the effect of the value rising at higher temp,
 humidity, etc.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1179>
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