Consider input method error correction flag for inputMethodHints

Qt::InputMethodHints include value Qt::ImhNoPredictiveText, however there is nothing for text correction so Meegotouch has an inputMethodQuery() extension here. Either a new flag should be introduced here, or documentation should be changed to cover both cases with the same flag. Probably both would be used at the same time.

Prediction = rest of the word can be predicted while typing.
Correction = input method can try to use e.g. dictionary to correct typos from already written text.