Redo Unique Symbols
Remove JNumericSpinner.

JSpinner does the job just as well.
Merge pull request #472 from agouge/UI

Facelift for Unique Symbols
Add boxed means classification
Change initialization order in getCreateClassificationPanel
It's important to create the "Create" button before the combo box that
holds the classification methods as this combo refreshes the state of
the button according to its currently selected method.
Fix a bug when trying to remove a line while the selected element is not the key but the label
Merge pull request #473 from agueganno/boxed-means

Introduce boxed means classification
Redo Proportional Point UI
Fix #474

Note: The code should be refactored to avoid duplicate methods. Similar
methods currrently exist:
* PnlUniquePointSE
  public void addPointOnVertices(ConstantFormPoint, JPanel)
* PnlRecodedPoint
  private JPanel pnlOnVertex()
* PnlCategorizedPoint
  private JPanel pnlOnVertex()
Redo UI for "Proportional Line"

Note: The code should be refactored to avoid duplicating the
getFirstConf/getSecondConf methods in PnlProportionalPointSE and
PnlProportionalLineSE.
Update javadoc
Fix translation problems
Fix translation problems, take 2.
Fix translation problems, take 3.
Merge pull request #475 from agouge/ui/proportional

Facelift for Proportional Point/Line