PSPP-BUG: [bug #15690] Refactor /MISSING subcommands.

[John Darrington]

Follow-up Comment #2, bug #15690 (project pspp):

My idea is to define a function type similar to 

/* Return true if case should be skipped */
typedef bool (*skip_case_predicate_t) (const struct ccase *c); 

... and then to add an argument to casefile_get_{destructive}_reader which is
the predicate to determine if each call to casereader_next_{xfer} should skip
a case.

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