exception guidelines for launchpad - good idea?

[Aaron Bentley]

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Robert Collins wrote:
| https://wiki.launchpad.canonical.com/ExceptionGuidelines
|
| That documents the recently decided guidelines for exception handling in
| launchpad. I think they are sane and we should adopt them for bzr.
|
| They dont have a great deal of rationale behind them, but I'm happy to
| add rationale as needed if folk have questions.

It looks okay, but the stuff on TypeError isn't clear to me.  I think
it's quite reasonable to throw TypeError if we get an argument of the
wrong type.  And since we are writing a library, the rationale about
writing an app doesn't hold.

Aaron
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