Add ()'s around 'and' action in ast2peg and update tests so they all … #1
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a simple peg of "exp <- 'a' ('/' 'b')*" failed the peg->ast->peg round trip due to function applyActionAstToPEG not putting ()'s around its op1 and op2 terms.
peg-parser tests have also been updated to reflect the modified re-grammar so they all pass