teach parrot and jvm about zerowidth literals
first draft of a before-assertion simplifier.
NQP RegexOptimizer for before assertions
less debug output
need to factor in both negations.
more dump output for Regex nodes.
remove apparently dangerous literal optimization
QRegex::Optimizer lives in NQPP6QRegex now.
optimize the topmost regex node as well ...
a scan followed by a BOS anchor is useless.
more work on the 'before' subrule.
pre-size the array for labels in alt.