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Removes clone of lines array

Forking duplicates the memory anyway, no need to clone them all first
Merge pull request #15 from oklasoft/drop_clone

Removes clone of lines array before fork()
Switching on threading by default
Adding statistics
Sort stats
Fix error
Stats
Adds failing feature spec for a deadlock

Requires non zero exit test & timeout from a patched regressiontest lib
Changes to wait/check pids before scanning for files

Quicker failures for follow up threads when failure detected
Merge pull request #16 from oklasoft/features/prevent-deadlock

Potential deadlock with multi threads & crashes in children