mozilla ast gen: optional return
debugging: getting rid of acorn rewrite, to be replaced by moz ast visitor
debugging: removing ancient rewriting logic, adapting stackreification for new scheme
debugging: we keep the id of function expressions
debugging: some interactive helpers for working with acorn asts
sever support: restricting server log text length, trying to fix issue #167
debugging: adding new tests to default test suite
debugging: rewriting code, cleanup part 1: now fully with moz ast visitor