Problems using single-copies of NonTerminal repetition constructs

[johnlumley]

Attempts to make single copies of non-terminal repetition constructs, such as a single

s-option: s | .

used by all occurrences of s? are causing problems on state prediction/completion of already completed states - some tests work under these conditions, others don't. Needs some clearer simple test cases to refine the use of 'already completed states' within prediction/completion of StateSet.