Python exceptions within coroutines are reraised #145
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Fixes #144.
Currently if a lua coroutine calls Python code which raises an exception, a LuaError will be raised and the original exception will be lost. This isn't consistent with the behavior of non-coroutine code, which is to reraise the exception, and losing the original exception makes it very hard to debug lua coroutines.
A new unit test
test_coroutine_reraises_python_error
has been added.