This fixes some Python and JavaScript unit tests caused by some recent

changes (and prepares fixes needed by a new version of kgb that's coming

up).
The JavaScript tests for the Review Dialog now checks for "Add General

Comment" instead of "Add Comment".
In Python, a few spies were using bad function signatures, which will

break in kgb soon. They've been fixed to use proper function signatures

that match the original function's requirements.
And finally, a bad assumption in the new e-mail hook compatibility code

where a variable was expected to not be None has been fixed. The

e-mail hook tests are all still broken right now, due to the usage of

getargspec() with spies, but the new kgb will fix those through some

new function introspection support.

Unit tests pass (using the new kgb).