Qonda

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* Adjust sizeHint calculation
* ValueListAdapter now is editable.
* Add DataWidgetMapper.addMappingsFromPropertyList() and
BaseAdapter.properties()
* Adds currentPyObject() method to TableView, TreeView and DataWidgetMapper
* Add DecimalSpinBoxDelegate.
* Add ListView (editable) widget
* Add RadioButtonGroup widget
* Fix: ObservableObject observe related objects when recreated by SQLAlchemy
* Fix: ObservableObject generates proper event for related object attributes
* Fix: ObservableObject must relay only events from other ObservableObject
* Fix: Make ObjectTreeAdapter understand properties as tuples (name, metadata)

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* Add use of '*' metadata key for properties common to all the attributes
* Add columnResizeMode metadata property
* Fix: Circular references in ObservableObject
* Fix: Make adapters work with updates on multiple attributes at once
* Fix: Ignore null/invalid values in Aggregator

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* Add SpinBox and DecimalSpinBox widgets and delegates
* ComboBoxDelegate supports empty combo models and editable combos.

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* Fix: Mapping of QLabel is read-only
* Fix: Proper float-str conversion in NumberEdit

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* PyQt5 compatibility
* Add property returnFormat to NumberEdit, value() can return either float or Decimal

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* Add new signal currentRowChanged to TableView and TreeView.
* Add properties allowAppends, allowInserts and allowDeletes to TableView and
TreeView, in order to control editing capabilities.
* Add currentRowChanged signal to TableView and TreeView.