* JavaDoc fixes.
* Overview Dialog:
  * added enum types with localization support for chart options
  * initialization of the choice boxes with the enums
* Overview Dialog: fixed width problem in choice boxes.
* Overview Dialog: added choice box for year selection.
* Overview Dialog: added ChartPanel (currrently Swing based).
* Overview Dialog: added event handlers for diagram updates.
* Overview Dialog: display in dialog title when exercise filter is enabled.
* Overview Dialog: display in dialog title when exercise filter is enabled.
* Overview Dialog: definition of string converter for sport type choice box.
* Overview Dialog: display sport type list selection depending on view type selection.
* Added interface Nameable.
* Added generic StringConverter for Nameable subtypes (JavaFX util).
* Overview Dialog: use of NameableStringConverter instead of specific implementation.
* Exercise Dialog: use of NameableStringConverter instead of specific implementation.