Giving dynamicETD3D own option

Changed according to Armin Hornungs comment. Now both subprojects
octovis and dyanmicEDT3D are optional and not coupled

CMakeLists.txt

@@ -4,10 +4,15 @@ PROJECT( octomap-distribution )
 ENABLE_TESTING()  # enable CTest environment of subprojects
 
 option(BUILD_OCTOVIS_SUBPROJECT "Build targets from subproject octovis" ON)
+option(BUILD_DYNAMICETD3D_SUBPROJECT  "Build targets from subproject dynamicEDT3D" ON)
 
 ADD_SUBDIRECTORY( octomap )
+
 if(BUILD_OCTOVIS_SUBPROJECT)
 	ADD_SUBDIRECTORY( octovis )
+endif()		
+
+if(BUILD_DYNAMICETD3D_SUBPROJECT)	
 	ADD_SUBDIRECTORY( dynamicEDT3D )
 endif()