Enhancement: Load main instance if no parent exists for a DataLinker
object
Enhancement: Added "hashtag" to "DataLinkerMeta" for easy unique
identification
Enhancement: Added runtime exceptions for different use cases
Enhancement: Combined "subs" and "objects" for representation of
embedded objects
Enhancement: Added getters for "linkertype", "objects" and count of
embedded objects (or children on categories)
Change: Changed naming for "hashtag". It is a normal tag representing a
DataLinker resource in the database.
Fix: Added unique tag validation for both "insert" and "update" actions