Array Construction Intrinsics

There are four intrinsics in this class:

• MERGE(TSOURCE,FSOURCE,MASK) -- merge two arrays under a mask,
• SPREAD(SOURCE,DIM,NCOPIES) -- replicates an array by adding NCOPIES of a dimension,
• PACK(SOURCE,MASK [,VECTOR ]) -- pack array into a one-dimensional array under a mask.
• UNPACK(VECTOR,MASK,FIELD) -- unpack a vector into an array under a mask.

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