MergeConstantDB:

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   Merges b into a using a GUI. The new file is saved as "NewDB.mat".
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   Form:
   MergeConstantDB( action, a, b )
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   ------
   Inputs
   ------
   action        (1,:)    Action to be taken
   a             (1,:)    Database to be merged and merged project
   b             (1,:)    Database to be merged

   -------
   Outputs
   -------
   h              (:)     GUI struct

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Children:

Common: FileUtils/FindDirectory