Python plugins, third round

[Aaron Bentley]

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Martin Pool wrote:
> Of these I think --no-plugins is the most important to have, because
> it helps debug or recover if something's gone wrong in the plugins.

It would also make sense if 'BZR_PLUGIN_PATH="" bzr $@' ran bzr with
plugins disabled.  (No BZR_PLUGIN_PATH -> use defaults,
BZR_PLUGIN_PATH="" -> no plugins, otherwise, use the exact
user-specified path.)

Aaron
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