<ticket>#475</ticket>
<ticket>#475</ticket>

Mashup widgets that appear on the drop-down list of suggested
values should not be editable.

--

gui/mashups/mashups_widgets.py
  class QDropDownWidget:
     createMenu()
       widgets added to list of values are readonly.
        Clicking on a value will set the radio button on its left as checked.

      new method: createMenuAliasWidget()

  new classes:
      QMenuValue
      QMenuValueItem

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