Fix the multiple visualization frame issue.

...va/fr/amap/lidar/amapvox/visualization/Visualization.java

...visualization/controllers/loadables/programs/Program.java

...lidar/amapvox/visualization/controllers/voxels/Space.java

...va/fr/amap/lidar/amapvox/visualization/views/Panel3D.java

...idar/amapvox/visualization/views/View3DInternalFrame.form

...idar/amapvox/visualization/views/View3DInternalFrame.java

...lidar/amapvox/visualization/views/VisualizationFrame.form

...lidar/amapvox/visualization/views/VisualizationFrame.java

...ualization/src/main/resources/textures/simplesky/back.png

...lization/src/main/resources/textures/simplesky/bottom.png

...alization/src/main/resources/textures/simplesky/front.png

...ualization/src/main/resources/textures/simplesky/left.png

...alization/src/main/resources/textures/simplesky/right.png

...sualization/src/main/resources/textures/simplesky/top.png