[MERGE] RegistryOption

[Aaron Bentley]

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Hi all,

This bundle adds a new option type: RegistryOption.  This allows an
option to be derived from a Registry.  It also implements it for the
BzrDir registry.

This allows automatic detection of invalid values, and a uniform way of
getting the option type.

If value_switches is True, it also provides individual switches for each
possible value.  This is similar to the way the various log formats
work: You can do "log --short" or "log --log-format short".

The diference is that Optparse recognises that the options are mutually
exclusive.  So "bzr init --metaweave --knit" will select "knit", but
"bzr init --knit --metaweave" will select "metaweave".  And "bzr init
- --knit --format=weave" will select "weave".

Aaron
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