[patch #6719] rewrite of interaction.c

[John Darrington]

Follow-up Comment #5, patch #6719 (project pspp):

Minor gnits:

* interaction.h still has 2007 in the copyright notice.

* Shouldn't interaction_variable_destroy free iv->members ?

* I think arg 1 of interaction_value_create can be const if you also change
intr member of interaction_value to const.

Otherwise I think it's fine.

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