With this function a group is created in memory, i.e. not associated with a
netCDF resource on file. This can be used to prepare new CF objects before
writing them to file. Extracting data from a CFVariable into a CFData
instance will also create a memory group.
makeMemoryGroup(id, name, fullname, title, history)A MemoryGroup instance.
The id of the group.
The name of the group.
The full path and name of the group.
The title attribute of the group.
The history attribute of the group.