Allow inline assign of literal values to EXTENT variables

[dlauzon]

Currently, this is valid: DEFINE VARIABLE i AS INTEGER NO-UNDO EXTENT INITIAL [1,2,3,4,5]. This is also valid: DEFINE VARIABLE i AS INTEGER NO-UNDO EXTENT INITIAL [1,2,3,4,5]. DEFINE VARIABLE j AS INTEGER NO-UNDO EXTENT INITIAL [1,2,3,4,5,6]. DEFINE VARIABLE k AS INTEGER NO-UNDO EXTENT. k = IF TRUE THEN j ELSE i. but this is not: DEFINE VARIABLE i AS INTEGER NO-UNDO EXTENT. i = [1,2,3,4,5]. We'd like the latter to be available to simplify conditional assignments e.g. iRelativeWidth = IF UsingFiveColumnsLayout THEN [20,20,10,30,20] ELSE [30,20,50].

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