renamed make_vertex with ID to make_vertex_with_id
fixed doxygen doku for file
Added doxygen doku for file and storage namespace
fixed doxygen doku for file, added return parameter doxygen doku
Rename make_vertex with ID to make_vertex_with_id, Added doxygen doku
renamed find_by_id -> find
removed function get_vertex_handle
doxygen fixed, added dereference_handle for elements with host element, added handle() default implementation
removed not needed specializations
renamed find_by_id -> find, adapted template parameter names
renamed max_id -> id_upper_bound
local_vertex doesn't need domain any more
doxygen documentation, deleted not needed functions/meta functions, template parameter and function parameter name changes