small change to declarative api: engine -> dataEngine

[Aaron J. Seigo]

hi ...

looking at the qml bindings it occured to me one reqeson people don't seem to 
notice right away the dataengine support: the tag that is recognized is 
"engine". what is an "engine"? ;) we tend to refer to them everywhere as 
DataEngines, in the JS API you access them with dataEngine .. 

we can also support engine: for backwards compatibility, of course..

i'm unsure where in the bindings this happens as a quick grep didn't point it 
out... Marco?

-- 
Aaron J. Seigo
humru othro a kohnu se
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KDE core developer sponsored by Qt Development Frameworks
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