Extracted filename prefix for snapshots to "messages.properties" and "messages_de_DE.properties" respectively.

Fix #160: In "TikzGenerator.java", use "String.format(Locale.US, ..." to force a dot as decimal separator.

In "TopographyWindow" and "Online/PostVisualizationWindows", replaced "About" button by "Setting" button.

implementation of the gui elements and actions to merge overlapping obstacles. The algorithm sometimes still fail and the undo/redo actions are not jet implemented.

In "PostvisualizationWindow.java", added button to generate TikZ image.

Action "ActionGenerateTikZ" is a copy of "ActionGenerateSVG".

Add new online and offline visualization button to toggle
group view for pedestrians.

New toolbar button with modal dialog to change width and size of
topography from the topography creator window.
Todo: new icon for resize action
Todo: Scenario Pane is not marked as changed (asterisk on scenario name)
Todo: Message Dialog for wrong syntax
Todo: allow comma an decimal point

Fix #42: in "ScenarioPanel.java", group model names in GUI under menu "Insert model name" (in "Model" tab).

Note: no unit tests have been written for new methods in "ClassFinder.java".