Transform multiple GADSdat objects into a list ready for data base creation.
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".
Details
The function createGADS takes multiple GADSdat objects as input. The function preserves the ordering
in which the objects are supplied, which is then used for the merging order in createGADS. Additionally,
the separate lists of meta information for each GADSdat are merged and a data frame unique identifier is added.
