[patch #5603] Separate command's parsing from their execution

[Ben Pfaff]

Update of patch #5603 (project pspp):

                  Status:   Ready For Test/Review => Works For Me           
             Assigned to:                     blp => jmd                    

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Follow-up Comment #1:

This is a good start.  In the end, I think we'll want a way to serialize and
deserialize a command to a machine-readable format.

I'm not sure I like the name cmd_context.  To me a "context" is something
dynamic, like a set of circumstances surrounding an event, but in fact any
given cmd_context is static and fixed at compile time.  A really good name
escapes me at the moment, but something more like cmd_{info,plan,class,form}
I might find less confusing.

I don't much like the name "API2".  It's just not descriptive.

Is it valid to destroy a command without running it?  If so, we should
provide a way to test it.



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