Clean up doxygen group

etc/doxygen/mainpage.dox

etc/doxygen/pages/Components.dox

etc/doxygen/pages/FAQ.dox

etc/doxygen/pages/GuiPlugins.dox

etc/doxygen/pages/HowTos.dox

etc/doxygen/pages/Overview.dox

etc/doxygen/pages/Tutorials.dox

source/armarx/navigation/algorithms/algorithms.h

...navigation/components/NavigationMemory/NavigationMemory.h

source/armarx/navigation/components/Navigator/Navigator.h

...e/armarx/navigation/components/example_client/Component.h

source/armarx/navigation/global_planning/core.h

...gation/gui-plugins/LocationGraphEditor/WidgetController.h

source/armarx/navigation/memory/memory.h