revlog: add a stronger test for raw processing There are some issues about revlog raw processing (flag processor). The test is relatively strong covering many cases. It will verify fixes.

hook: add hook name information to external hook While we are here, we can also add the hook name information to external hook.

hook: provide hook type information to external hook The python hooks have access to the hook type information. There is not reason for external hook to not be aware of it too. For the record my use case is to make sure a hook script is configured for the right type.

hook: use 'htype' in 'hook' Same rational as for 'runhooks', we fix the naming in another function.

hook: use 'htype' in 'runhooks' Same rational as for '_pythonhook', 'htype' is more accurate and less error prone. We just fixed an error from the 'name'/'hname' confusion and this should prevent them in the future.

hook: fix name used in untrusted message The name used in the message we issue when a hook is untrusted was using "name" which is actually the hook type and not the name of the hook.