Split a GADSdat into multiple, specified hierarchical levels.
Value
Returns an all_GADSdat object, which consists of list with a list of all data frames "datList" and
a single data frame containing all meta data information "allLabels". For more details see also mergeLabels.
Details
The function takes a GADSdat object and splits it into its desired hierarchical levels (a all_GADSdat object).
Hierarchy level of a variable is also accessible in the meta data via the column data_table. If not all variable names
are included in the nameList, the missing variables will be dropped.
